Rewrite the sentence:
I said that she should see a doctor.

 

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Would you believe that your diet can make a big difference in keeping a youthful appearance? It seems strange to think that the food we take in could result in fewer wrinkles. Wouldn’t it be better to put things on our skin rather than in our mouths? Well, according to one scientific theory, our bodies start aging because of oxidation. This is caused by certain oxygen-containing molecules in our cells, called free radicals. Free radicals have the capability to attach to and damage parts of our cells, including our DNA. Our bodies have the ability to repair this damage. However, as we get older, these repair mechanisms start to break down, resulting in signs of aging, such as wrinkles. Free radicals are actually produced by our bodies, but their numbers can also increase because of the food we eat. Besides avoiding foods that could potentially produce more free radicals, eating foods that contain certain vitamins and micro-nutrients can also keep us looking young. These vitamins help produce molecules called antioxidants, which actually help reduce the production of free radicals. Even better, foods containing antioxidants are not rare. Common antioxidants, like vitamins A and E, can be found in many dark-colored vegetables. For example, carrots, seaweed, spinach, and broccoli are all excellent sources of these helpful vitamins. Also, you can eat orange-colored fruits like apricots and peaches. Vitamins A and E are particularly good for helping your skin remain young-looking. These nutrients strengthen your skin and make it soft. However, if you really want to stock up quickly on nutrients that benefit your skin, you should eat cow’s liver. One small piece of cooked cow’s liver contains twice as much vitamin A as half a cup of cooked carrots.  More recently, green tea has also been tentatively added to the list of youthpromoting substances. Research on green tea’s effects on our bodies is still in the early stages. Scientists certainly believe that it is good for us, but they are cautious about predicting its ability to keep us looking youthful. However, recent experiments seem to show that green tea’s antioxidant properties can repair cell damage already sustained as well as prevent damage in the future. In fact, green tea works even better if you apply it directly to your skin as an ingredient in facial cream. “You are what you eat.” The more we find out about how our bodies work, the more this old proverb seems to be true. Think about that the next time you sit down at the table.  
6. Which of the following is NOT true?

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Human beings are plagued by all kinds of diseases and millions of people die from them. Many of these diseases such as diabetes, polio, whooping cough and diphtheria can be fatal and in the past, people used to die from them. However, with modern technology and a lot of research, scientists and doctors have come up with various ways to cure these diseases, and consequently, many lives are saved. In doing the medical research, doctors have come face to face with many problems. One such problem is the opposition that comes from animal activists. They are against the inhuman treatment of animals. They argue that in conducting their medical research, doctors put animals through a very painful process and this should be stopped. According to the fiercest animal activists, nothing justifies the use of animals in medical experiments, even if lives might be saved. To get their message across, animal activists are even willing to resort to the use of violence. Many animal protection groups, like the Animal Liberation Front (ALF), have broken into laboratories illegally to ‘rescue’ animals. They take away whatever animals they can find and free them. These people also make their case by threatening the researchers. They vandalize medical equipment, and in the most serious cases, they even . In stealing the animals, the activists are actually hindering the progress of medicine. In many cases, the animals were part of research for the cure for various diseases and visual defects in babies. Cures for problems that people face, therefore, come slower and in the waiting period, more people die. Researchers have come up with many cures in the process of working with animals and on animals. Organ transplants are so common today, but we forget that they became only  possible after they were tested on animals. Doctors were able to come up with a cure for river blindness, a disease that affects millions of people in South America and Africa. These are only a few examples, and there are many more. In spite of what animal activists think, most researchers do not treat animals cruelly. In fact, mistreated animals which are in agony will affect the quality of research so that results obtained are not really reliable. Thus, researchers do try to treat animals as well as possible. In the long run, animal activists can cause serious damage to the future of medicine. With their persistent campaigning, much of the public supports their cause. People with AIDS or cancer need doctors to do research to save their lives, and often it is a case where animal research is crucial before any cure can be found  
5. Which of the following might NOT be the purpose of doing medical researches?

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The new invention may receive a lot of __________ from the public.

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Hidden beneath the waves of the Tyrrhenian Sea near southwestern Italy lies a newfound volcanic mosaic dotted with geothermal chimneys and flat-topped seamounts. This complex is new to both science and the planet, geologically speaking; it’s only about 780,000 years old. Scientists aren’t particularly surprised to find volcanism in the region, which is home to active volcanoes like Mount Vesuvius and Mount Etna. But the new complex is unusual because it was created by a rare kind of fault, said study leader Fabrizio Pepe. The western Mediterranean is seismically restless because of the collision of three tectonic plates: the African, the Eurasian and the Anatolian. Making matters more complex is a small chunk of crust called the Adriatic-Ionian microplate, which broke off of the African Plate more than 65 million years ago and is now being pushed under the larger Eurasian Plate in a process called subduction. Previously, scientists discovered a series of undersea volcanic arcs created by this tectonic unrest, starting near the Sardinian coast, with increasingly younger arcs southward and eastward. These arcs were like an arrow pointing ever farther eastward, prompting Pepe and his colleagues to search for an even younger arc about 9 miles off the coast of Calabria. There, based on seafloor mapping, seismic data and magnetic anomalies, the researchers found a 772-square-mile region of lava flows, volcanic mountains and hydrothermal chimneys; vents in the seafloor allow hot minerals to spew out and form chimney-like structures. They dubbed the new area the Diamante‐Enotrio‐Ovidio Volcanic‐Intrusive Complex, after three flat-topped seamounts that dominate the seafloor. Those fractures are what allowed magma to rise to the surface at the Diamonte-EnotrioOvidio complex, creating an undersea landscape of lava flows and mountainous volcanoes. These volcanic seamounts are now plateaus because they protruded from the ocean when the sea level was lower, and they eroded into their present, flat-topped shape, Pepe said. The volcanic complex is inactive, but there are small intrusions of lava in some parts of the seafloor there. However, the area could become active in the future, Pepe said, and active volcanism is ongoing on the eastern side of the Tyrrhenian Sea. The researchers are working to build a volcanic risk map of the complex to better understand if it could endanger human life or property. They are also investigating the possibility of tapping the complex to produce geothermal energy.  
1. Which best serves as the title for the passage?

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Modern society has given significant attention to the promises of the digital economy over the past decade. But it has given little attention to its negative environmental footprint. Our smartphones rely on rare earth metals, and cloud computing, data centers, artificial intelligence and cryptocurrencies consume large amounts of electricity, often sourced from coal-fired power plants. These are crucial blind spots we must address if we hope to capture the full potential of the digital economy. Without urgent system-wide actions, the digital economy and green economy will be incompatible with each other and could lead to more greenhouse gas emissions, accelerate climate change and pose great threats to humanity. The world’s data centers-the storehouses for enormous quantities of information - consume about three percent of the global electricity supply (more than the entire United Kingdom), and produce two percent of global greenhouse gas emissions-roughly the same as global air travel. A report by Greenpeace East Asia and the North China Electric Power University found that China’s data centers produced 99 million tonnes of carbon dioxide in 2018, the equivalent of about 21 million cars driven for one year. Greenhouse gases aren’t the only type of pollution to be concerned about.Electronic waste (e-waste), which is a byproduct of data center activities, accounts for two percent of solid waste and 70 percent of toxic waste in the United States. Globally, the world produces as much as 50 million tonnes of electronic e-waste a year, worth over US$62.5 billion and more than the GDP of most countries. Only 20 percent of this e-waste is recycled. The world and its intractable challenges are not linear-everything connects to everything else. We must raise awareness about these major blind spots, embrace systems leadership (leading across boundaries), boost circular economy ideas (decoupling economic activity from the consumption of finite resources), leverage an eco-economics approach (an environmentally sustainable economy) and encourage policy-makers to explore the interrelationships between government-wide, system-wide and societal results. We must also consider collective problem-solving by bringing together diverse perspectives from both the Global North and the Global South. We should take an inventory of the global and local damages caused by electronic devices, platforms and data systems, and frame issues about the digital economy and its environmental impact in broad societal terms.
5. The word “linear” in paragraph 4 is closest in meaning to _______

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Coal, oil and gas get more than $370bn a year in support, compared with $100bn for renewables, the International Institute for Sustainable Development (IISD) report found. Just 10-30% of the fossil fuel subsidies would pay for a global transition to clean energy, the IISD said. Ending fossil fuel subsidies has long been seen as vital to tackling the climate emergency, with the G20 nations pledging in 2009 to phase them out, but progress has been limited. The new analysis shows how redirecting some of the fossil fuel subsidies could decisively tip the balance in favour of green energy, making it the cheapest electricity available and instigating a rapid global rollout. The transition from polluting fossil fuels to clean energy is already under way. Annual investment in renewables has been greater than that in fossil fuel electricity generation since 2008 and new renewable capacity has exceeded fossil fuel power each year since 2014. But progress is slow compared with the urgency required, said Bridle. “There is no question that renewables can power the energy system,” he said. “The question now is can we transit quickly enough away from fuels like coal, and subsidy reform is a very obvious step towards that.  Reform of fossil fuel subsidies could have a significant impact on global heating. An earlier IISD study of 20 countries with large fossil fuel subsidies found that a 30% swap to renewables would lead to emissions reductions of between 11% and 18%. Most experts define fossil fuel subsidies as financial or tax support for those buying fuel or the companies producing it. The IMF also includes the cost of the damage fossil fuel burning causes to climate and health, leading to an estimate of $5.2tn of fossil fuel subsidies in 2017, or $10m a minute. Ending the subsidies would cut global emissions by about a quarter, the IMF estimates, and halve the number of early deaths from fossil fuel air pollution. Bridle said funding fossil fuel subsidies was “madness”, but said ending them could cause short-term price rises and political difficulties, as the benefits of lower costs in the future and reduced air pollution are less obvious. “There are political problems but it is worth persevering because the prize is so big,” he said. “You have to bring people along with you.” Gençsü said governments must ensure that the most vulnerable people were not adversely affected by changes. 
4. What does the word “reform” in paragraph 3 most likely mean?

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Most sources of illumination generate light over an appreciable period, and indeed if  an object is lit for a very brief time(less that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic flash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoflash is now generated electronically, but the earliest form, first used in 1864, was a paper bag containing magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense flash. A contemporary observer reported that “this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”  The evolution of the photoflash was slow, flashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920’s. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The flash was fired by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen difluoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reflecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time. 
1. What is the best title for the passage?

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Nuts could be the key to keeping slim, according to new research. Scientists from Harvard University and Harvard Medical School say that replacing and unhealthy snack with half a daily _____ (1) of nuts could slow weight gain in people as they get older. Walnuts ____________ (2) particular appeared to offer good results and were linked to a 15% lower risk of obesity. Researchers conducted a long-term study which followed 51,529 male health professionals aged 40 to 5, 121,700 nurses aged 35 to 55 and 16,686 nurses aged 24 to 44. Participants had their weight ____________ (3) every four years and were asked how often they had eaten nuts. They also had to report their exercise every two years. The findings, ___________________ (4) in the online journal BMJ Nutrition, Prevention and Health, showed that increasing nut consumption was associated with less risk of putting on two or more kilos over a four-year period. However, the researchers say the study is ________ (5) and therefore cannot establish a definite cause

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New York city is well-known _______ the Statue of Liberty.

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The word noise is derived from the Latin word nausea, meaning “seasickness”. Noise is among the most pervasive pollutants today. Noise pollution can broadly be defined as unwanted or offensive sounds that unreasonably intrude into our daily activities. Noises from traffic, jet engines, barking dogs, garbage trucks, construction equipment, factories, lawn mowers, leaf blowers, televisions, boom boxes and car radios, to name a few, are among the audible litter that is routinely broadcast into the air. One measure of pollution is the danger it poses to health. Noise negatively affects human health and well-being. Problems related to noise include hearing loss, stress, high blood pressure, sleeplessness, fright, distraction, and lost productivity. Noise pollution also contributes to a general reduction in the quality of life and eliminates opportunities for tranquility. We experience noise in a number of ways. On some occasions, we can be both the cause and the victim of noise, such as when we are operating noisy appliances or equipment. There are also instances when we experience noise generated by others, just as people experience secondhand smoke. In both instances, noise is equally damaging physically. Secondhand noise is generally more troubling, however, because it is put into the environment by others, without our consent. The air into which secondhand noise is emitted and on which it travels is “a commons”. It belongs not to an individual person or a group, but to everyone. Please, businesses and organizations, therefore, do not have unlimited rights to broadcast noise the as they please, as if the effects of noise were limited only to their private property. Those that disregard the obligation to not interfere with other’ use and enjoyment of the commons by producing noise pollution are, in many ways, acting like a bully in a schoolyard. Although they may do so unknowingly, they disregard the rights of others and claim for themselves rights that are not theirs. The actual loudness of a sound is only one component of the negative effect noise pollution has on human beings. Other factors that have to be considered are the time and place, the duration, the source of the sound, and even the mood of the affected person. Most people would not be bothered by the sound of a 21-gun salute on a special occasion. On the other hand, the thump-thump of music coming from the apartment downstairs at 2a.m, even if barely audible, might be a major source of stress. The sound of neighbor’s lawn mower may be unobjectionable on a summer afternoon, but if someone is hoping to sleep late on a Saturday morning, the sound of a lawn mower starting up just after sunrise is an irritant  
7. Which of the following is NOT one of the components of the negative effects that noise pollution has on people?

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Sylvia Plath’s semi-autobiographical 1963 book “The Bell Jar” is most likely to be found in a sophomore English class, pored over by high-school students. But recently at Squarefoot, a commercial real estate company based in Manhattan, it was the chosen book title for the office book club. “People really latched onto [“The Bell Jar”] and talked about women’s roles in the workplace,” says Eliza Bell, people-operations manager. “The book club has been a bonding opportunity. People are able to learn about each other, and it’s really nice to talk about stuff that isn’t work-related. ‘The Bell Jar’ really brought that out, and we were able to talk about diversity initiatives.” Over the summer, the book pick was “The Hate U Give,” the 2017 young adult novel by Angie Thomas. The monthly club meets during a lunch that is provided by the company. In its first iteration, the club met after work and read business books: Not surprisingly, people weren’t quite as enthusiastic about that initiative. The club is the brainchild of CEO Jonathan. Wasserstrum, who is passionate about reading. There are some rules: At the beginning everyone has a chance to express what they liked or didn’t like. “If someone goes on a rant, it’s important to change the topic and move to another one,” says Bell. “When we read ‘The Last Lecture’ [the 2008 bestseller co-authored by the late Randy Pausch] for instance, it got a little heated.” What makes for a good pick? “We need an aspect of it to get people excited. It’s important that the books are ones people will have opinions on. People can learn from all sorts of different books,” says Bell. “And they have to be less than 250 pages.”  
3. According to paragraph 1, which statement is NOT correct about the novel “The Bell Jar”?

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On an Old Quarter thoroughfare of Hanoi, known as train street, locomotives rumble down an active track just inches away from homes and other buildings. The juxtaposition of train tracks and residential housing has made it hugely popular among travelers to the capital of Vietnam. But the municipal government of Hanoi has ordered that cafes alongside the heavily Instagrammed train tracks – which sprung up to cater to the tourism boom – must close. Authorities cite danger to human life as the primary motivator for the shutdown. The boiling point apparently came on Sunday, when a train traveling through Hanoi was forced to reroute because there were too many tourists on the tracks, which were built in 1902 by the French. “Though the railway cafes attract tourists, they are, in fact, violating some regulations,” Ha Van Sieu, vice chairman of the Vietnam National Administration of Tourism, told reporters at a press briefing. In 2018, Vietnam-based writer Dave Fox told CNN Travel that “overtourism is a new buzzword for something that has been going on a long time.” A longtime Hanoi resident, he watched as “train street” transformed from a cool novelty into a safety concern. “Travelers need to be mindful of optics,” he added. When it comes to overtourism, some destinations face more of a challenge than others. In Indonesia, moves have been made to greatly restrict traveler access to Komodo Island, home to the famous Komodo dragon. Initially, the country had considered shutting the island to tourists completely, but settled on a plan with limited access to visitors who could pay a high access fee. And nearby in Thailand, the heavily popular Maya Bay, made famous by the film “The Beach” has been closed since 2018 to repair the most severe outcome – environmental damage. 
5. According to the passage, the major consequence of overtourism is _______________

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Seeing the glass as half full may mean a longer life, according to research suggesting that optimists not only live longer in general, but have a better chance of reaching 85 or older. People of an upbeat disposition have previously been found to have a lower risk of heart conditions and premature death. Researchers now say it could also play a role in living a long life. “A lot of evidence suggests that exceptional longevity is usually accompanied by a longer span of good health and living without disability, so our findings raise an exciting possibility that we may be able to promote healthy and resilient ageing by cultivating psychosocial assets such as optimism,” said Lewina Lee, the lead author of the study at Boston University School of Medicine. Writing in the Proceedings of the National Academy of Sciences, Lee and colleagues report how they analysed data from two previous long-term research projects, one involving female nurses and the other focused on a cohort of men. The former team compared lifespan for the most optimistic with the least, taking into account factors including age, sex, race, education, depression and other health conditions present at the outset. The results show the most optimistic group of women had a lifespan almost 15% longer than the least. As for the other project, when the team compared the fifth of men boasting the highest optimism scores with the least optimistic, they found the most positive men had lifespans almost 11% longer. But being optimistic was not only linked to a longer lifespan. For men and women it was also linked more specifically to living to 85 or older when health behaviours were taken into account, with the most optimistic group of women having 20% better odds of reaching age 85 than the least. Lee said it was not yet clear why optimism is linked to longevity. “In our study, healthier behaviours, fewer depressive symptoms, and more social ties only partially accounted for the association from optimism to exceptional longevity,” Lee said, adding there are likely to be other mechanisms at play, such as optimistic people coping better with stress. Dr Catherine Hurt, an expert in health psychology at City, University of London, said the study highlighted the importance of psychological wellbeing alongside physical wellbeing for living a long and healthy life.
6. The word “odds” in paragraph 3 can be replaced by _______

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Globally we use more energy than ever before, and the demand is rapidly growing. Economic expansion of emerging market economies, population growth and our increasing use of energy-consuming devices are among the most important contributing factors. About one-third of the radiation hitting Earth’s atmosphere is reflected back out into space by clouds, ice, snow, sand and other reflective surfaces. The other two-thirds is absorbed by the Earth’s surface and the atmosphere. As the land, oceans and atmosphere heat up, they re-emit energy as infrared thermal radiation, which passes through the atmosphere. Heat-trapping gases like carbon dioxide (CO2) absorb this infrared radiation and prevent it from dissipating into space, giving rise to what we know as the greenhouse effect. The accumulation of CO2 and other greenhouse gases in the atmosphere is the dominating driver of recent climate change. CO2 is estimated to be responsible for 64 % of man-made global warming. Other greenhouse gases are released in much smaller amounts but still contribute significantly to the overall warming effect, as they are much more potent heat-trapping gases than CO2. The EU is taking action on many levels. One example is on fluorinated gases that are contributing less than CO2 but still a particular point of concern in addressing climate change. They are used in several types of products, such as in refrigeration, air-conditioning and heat pump equipment. While fluorinated gases are released into the atmosphere in smaller quantities than other greenhouse gases, they are extremely potent – they produce a warming effect 23 000 times greater than CO2. For this reason the EU has decided to control their use. The EU’s regulation on fluorinated greenhouse gases aims at cutting the Union’s emissions by two-thirds compared to 2014 levels. Chemicals are not only part of the problem – they are also part of the solution. Sustainable energy sources like solar power rely on chemical innovation using, for example, nanomaterials. One of the main challenges with renewable energy is how to increase its viability with the help of energy storage solutions. For example, solar panels have the best conditions in the desert, but that is not where most people live. Windmills also produce power during the night, which is when our energy consumption is at its lowest. In other words, technologies to improve energy storage and transportation is one of the important areas of research where innovation is needed  
4. The word “potent” in paragraph 2 can be replaced by _______

Each sentence has a mistake. Find it by chosing A B C or D

Young women are in the major in the fashion industry

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As communities across the U.S. replace forests and woodlands with housing developments and other new construction, researchers are noting an increase in Lyme disease. To help prevent the spread of Lyme disease, Dr. Ivan Castro-Arellano, a disease ecologist and wildlife researcher at Texas State University, is exploring how urbanization and its effects on mammals impact the spread of pathogens.  Lyme disease, which spreads from animals to humans, is one of the fastest growing zoonotic diseases in the United States. Counties considered high-risk for Lyme disease grew 300% between 1993 and 2012. Caught quickly, Lyme disease is easily treated with antibiotics, but if it goes untreated it can lead to chronic issues such as Lyme arthritis, facial palsy and impaired memory. Many such zoonotic diseases have been increasing globally, researchers say, partially because of the displacement of animals. While medium- and large-sized mammals are displaced or eradicated by the removal of forested areas, whitefooted mice and deer thrive in small patches of green space. Mice and deer are contributing to favorable conditions for an increase in the ticks that spread the pathogens causing Lyme disease. Although East Texas has a similar pattern of woodland space compared to new construction as the northeast United States, Texas contract the disease at lower rates. This fact piqued the interest of Castro-Arellano. In addition to studying the area where the disease is prevalent, he decided to study where the disease is not prevalent to find keys to prevention. Castro-Arellano is part of a team of biologists, veterinarians and biomedical researchers that have been collecting samples and trying to understand what makes East Texas different. He believes that the climate, or certain species of East Texas mammals who kill ticks, could be contributing to the reduced tick population in East Texas.
1. Which best serves as the title for the passage?

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It’s important to be able to articulate your dream job. Not just for personal reasons,  but also for when you’re asked about it in interviews. But, how can you even begin to describe your ideal job, especially to someone who’s clearly going to be judging your response? Just picking a place to start is a head-scratcher.  First, let’s talk about what you’re good at doing, or your strengths. It’s likely you’ve already had the chance to talk about this topic a bit during the interview, so it makes for a nice transition. Highlight the skills that you enjoy using most, not just the ones you’re a superstar at. This is about your dream job, so don’t shy away from mentioning any that you want to grow as well.  Think big picture for this. What drew you to your industry? What’s something you did as a kid that’s actually found its way into your work? What is it about your career that keeps you engaged? Weave that in. Giving a sense of what your career values are will give the interviewer an idea about what motivates you; it’s a good way to bring the focus back to the company you’re interviewing for. It also adds some extra complexity to your answer. You’re not just saying, “I want an interesting job that I’m good at.” I mean, that’s nice, but this is your dream job we’re talking about! Don’t pigeonhole yourself with anything that official. Instead, give the hiring manager a more nuanced response by covering your skills, interests, and values. He or she will get the chance to learn more about you—and you have more flexibility to line up your career goals and the position you’re applying for. That’s a win-win. 
1. Which best serves as the title for the passage?

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Seniors in China are still highly likely to believe rumors and pseudoscience, according to reports. In recent years, China has seen more scientists and science communicators using digital platforms to combat pseudoscience, which is classified as rumors, statements, beliefs, ideas or practices that are stated as fact, but are often fabricated and scientifically untested. Despite that, many young Chinese have experienced difficulties when trying to pass on that message to older people. For example, last year, Dingxiang Doctor, a digital platform that debunks medical rumors online, released 101 articles that disproved common, inaccurate claims. However, many netizens said that when they forwarded the articles to family chat groups, they were questioned, scolded and even removed from the group by older family members. An online survey last year by Tencent, one of China’s biggest online businesses, indicated that nearly 40 percent of middle-aged and senior people had experienced online fraud, mostly related to healthcare products. Yun Wuxin, a food engineering expert who has popularized food science for more than 10 years, believes that, in general, members of the older generation lacked training in logical or critical thinking when they were young, so they have an exaggerated belief in personal experience, tradition or superstition. He said young people, especially today’s younger generation, have received better training and tend to hold skeptical or critical attitudes toward convention. He added that new media that popularize science in fresh, innovative ways － such as short videos, video blogs and animations － are very effective with young people. However, traditional methods, including television, community visits by scientists, neighborhood exhibitions and science columns in newspapers, are very important for middle-aged and elderly people who really need to understand science  
3. The word “they” in paragraph 2 refers to _______

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In the folklore of the Navajo people, it was said that frogs and toads fell from the sky when it (1)________. The phenomenon that gave rise to this belief involved the spade foot toad, which remains dormant beneath the Sonoran Desert of Arizona, (2)_________ the heat and drought for as long as eight or nine months. With the onset of summer thunderstorms, however, the toads respond to the vibrations of drumming raindrops and emerge, as if fallen from the sky with the rain, (3)__________their brief and frantic mating season. The male spade foot sits in a muddy pool and fills the night with his calls, attempting to attract a female of the same species. Once a female joins him, she may lay as many as 1,000 eggs in the small pool of rainwater. From that point it’s a race against the elements for the young, (4)_________ must hatch and mature with remarkable speed before the pool evaporates beneath the searing desert sun. As the pool grows smaller and smaller, it became thick with tadpoles fighting for survival in the mud, threatened not only by the loss of their watery nest but also by devouring insects and animals. In as few as nine days after fertilization of the eggs, those lucky enough to survive develop through each tadpole stage and finally emerge as fully formed toads. After (5)______ themselves on insects, the young toads like their parents, burrow underground, where they will lie dormant awaiting the next summer’s storms

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A (1) ______ teacher can reach thousands of students in an online course, opening up a world of knowledge to anyone with an internet connection. This limitless reach also offers substantial benefits for school districts that need to save money, by reducing the number of teachers. (2) __________, in high schools and colleges, there is mounting evidence that the growth of online education is hurting a critical group: the less proficient students (3) _______ are precisely those most in need of skilled classroom teachers. Online courses can be broken down into several categories, and some are more effective than others. In “blended” courses, for example, students don’t do their work only online: They also spend time in a classroom with a flesh-and-blood teacher. Research suggests that students — at nearly all levels of achievement — do just as well in these blended classes as they do in traditional classrooms. In this model, online resources supplement traditional instruction but don’t replace it. In the fully online model, on the other hand, a student may never be in the same room with an instructor. This category is the main problem. It is where less proficient students tend to (4) _________ trouble. After all, taking a class without a teacher requires high levels of self-motivation, self-regulation and organization. Yet, in high schools across the country, students who are struggling in (5) ________classrooms are increasingly steered into online course