Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.
                   Why read books?
Is it worth reading books, (16)........ nowadays there are so many other forms  of entertainment? Some people say that even paperback books are expensive, and not everyone can borrow books from a library. They might add that television is more exciting and that viewers can relax as they watch their favourite (17)........... . All that may be true, but books are still very popular. They encourage the reader to use his or her imagination for a start. You can read a chapter of a book, or just a few pages, and then stop. Of course, it may be so (18).......... _ that you can’t stop!  There are many different kinds of books, so you can choose a crime novel or an autobiography, or a book (19).........gives you interesting information. If you find it hard to choose, you can read  reviews, or ask friends for ideas. Personally, I can’t do without books, but I can (20)............. up television easily enough. You can’t watch television at bus stops!
(20)...................................

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Most Americans eat three  meals (10)...... the day: breakfast, lunch, and dinner. Breakfast begins between 7:00 and 8:00am, lunch between 11:00 am and noon, and dinner between 6:00 and 8:00 pm. On Sundays  "brunch" is  a (11) ..................of breakfast and lunch, typically beginning at 11:00 am. Students often enjoy a "study break" or evening snack around 10:00 or 11:00 pm. Breakfast and lunch tend to be light meals, with only one course. Dinner is the main meal.
For breakfast Americans will eat cereal with milk which are often mixed (12)......... in a bowl, a glass of orange juice, and toasted bread or muffin with jam, butter, or margarine. Another common breakfast meal is scrambled eggs or an omelet with potatoes and breakfast meat (bacon or sausage). People who are on a diet eat just a cup of yogurt. Lunch and dinner are more (13)............ . When eating at a formal dinner, you may be overwhelmed by the number of utensils. How do you (14)..........the difference between a salad fork, a butter fork, and a dessert fork? Most Americans do not know the answer. But knowing which fork or spoon to use first is simple: use the outermost utensils first and the utensils closest to the plate last.
(13)..............................

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Did you ever watch a video on the Internet? Maybe you used YouTube. YouTube is a Website where people can share their video. Today, YouTube is an important part of the Internet. However, that wasn’t always true.
YouTube started with a young man named Jawed Karim and two friends. One day, Karim was on the Internet. He wanted information about the 2004 tsunami in Southeast Asia. He found news stories about it, but he couldn't find any videos. This gave Karin an idea. He wanted to help people put video on the Internet. Karim told his friends about this idea. Together, they created a company - YouTube.
YouTube become a global success. Millions of people around the world Visited the Website. It was clear to Google, another Internet company, that YouTube had a lot of value. Google made a deal. It bought YouTube for $1.65 billion. As a result, YouTube investors and its employees made a lot of money. The three friends who started YouTube were very big investors. Therefore, they made an enormous amount of money.
Karim became very rich, and he continued to work toward his PhD. There was something else he wanted to do. He wanted to help young people go into business. He used money and experience to start a new company called Youniversity Ventures. This company helps young people who have good business ideas. It gives them advice and money to start Internet businesses. Milo is one business that students started with the help of Youniversity Ventures.
Milo is a shopping Website. It helps people find products in stores near their homes. Another example is AirBoB. This Web site helps people find for video conferences. People in different places can use this site to have business meetings.
Karim has some advice for students who want to start business. First, find a successful company. Do a lot of research about the company and the top people in the company. There, copy the way they do things. For students who wants to start Interner business, Karim is probably a very good example to copy. 

Which of the following in NOT mentioned about Karim?

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Christina and James met in college and have been dating for more than five years. For the  past two years, they have been living together in a  condo  they  purchased jointly. While Christina and James were confident in their decision to enter into a commitment like a  20-year mortgage,  they are unsure if they want to enter into marriage. The couple had many discussions about marriage and decided that it just did not seem necessary. Wasn't it only a piece of  paper? And  didn't half of all marriages end in divorce?
Neither Christina nor James had seen much success with marriage while growing up. Christina was raised by a single mother. Her parents never married, and her father has had little contact with the family since she was a toddler, Christina and her mother lived with her maternal grandmother, who often served as a surrogate parent. James grew up in  a  two-parent household  until age seven, when his parents divorced. He lived with his mother for a  few years, and then    later with his mother and her boyfriend until he left for college. James remained close with his  father who remarried and had a baby with his new wife.
Recently, Christina and James have been thinking about having children and the subject of marriage has resurfaced. Christina likes the idea of her children growing up in a traditional  family; while James is concerned about possible marital problems down the road and negative consequences for the children should that occur. When they shared these concerns with their parents, James's mom was adamant that the couple should get married. Despite having been divorced and having a live-in boyfriend of 15  years, she believes that children are better off when  their parents are married. Christina's mom believes that the couple should do whatever they want but adds that it would "be nice" if they wed. Christina and James's friends told them, married or not married; they would still be a family.

What does the passage mainly discuss?

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   Martin Luther King, Jf., is well- known for his work in civil rights and for his many famous speeches, among which is his moving “I have a dream” speech. But fewer people know much about King’s childhood.

   M.L, as he was called, was born in 1929 in Atlanta, Georgia, at the home of his maternal grandfather. M.L.’s grandfather purchased their home on Auburn Avenue in 1909, twenty years before M.L was born. His grandfather allowed the house to be used as a meeting place for a number of organizations dedicated to the education and social advancement of blacks. M.L. grew up in the atmosphere, with his home being used as a community gathering place, and was no doubt influenced by it.

   M.L.’s childhood was not especially eventfully. His father was a minister and his mother was a musician. He was the second of three children, and he attended all black schools in a black neighborhood. The neighborhood was not poor, however. Auburn Avenue was an area of banks, insurance companies, builders, jewelers, tailors, doctors, lawyers, and other businesses and services. Even in the face of Atlanta’s segregation, the district thrived. Dr. King never forgot the community spirit he had known as a child, nor did he forget the racial prejudice that was a huge barrier keeping black Atlantans from mingling with whites.

According to the author, blacks in King's neighborhood were involved in all the following businesses and services EXCEPT

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When living and working in another country, there are numerous things to consider apart from the more obvious ones of climate, language, religion, currency, etc. Some important considerations are less obvious. For example, do you have a pet or do you enjoy a hobby such as horse riding? Your animal or hobby may be perceived in a completely different light in another culture so it’s important to consider the significance given to specific animals in different parts of the world and general perceptions towards them.
One example which is often mentioned in popular press is the case of dogs. In some cultures, like the US or UK, dogs are loved and considered a great pet to have at home and with the family. In other cultures, such as those where Islam is the majority religion, dogs may be perceived as dirty or dangerous. Muslims treatment of dogs is still a matter of debate amongst Islamic scholars. While these animals are widely considered by many Western cultures to be „man’s best friend’, the Koran describes them as “unhygienic”. Muslims will therefore avoid touching a dog unless he can wash his hands immediately afterwards, and they will almost never keep a dog in their home.
In Iran, for instance, a cleric once denounced „the moral depravity’ of dog owners and even demanded their arrest. If you are an international assignee living and working in Saudi Arabia or another Arabic country, you should remember this when inviting Arab counterparts to your house in case you have a dog as a pet. This is just one example of how Islam and other cultural beliefs can impact on  aspects of everyday life that someone else may not even question. A Middle Eastern man might be very surprised when going to Japan, for instance, and seeing dogs being dressed and pampered like humans and carried around in baby prams!
Dogs are not the only animals which are perceived quite differently from one culture to another. In India, for example, cows are sacred and are treated with the utmost respect. Conversely in Argentina, beef is a symbol of national pride because of its tradition and the high quality of its cuts. An Indian working in Argentina who has not done his research or participated in a cross cultural training programme such as Doing Business in Argentina may be surprised at his first welcome dinner with his Argentinean counterparts where a main dish of beef would be served.
It is therefore crucial to be aware of the specific values assigned to objects or animals in different cultures to avoid faux–pas or cultural misunderstandings, particularly when living and working in another culture. Learning how people value animals and other symbols around the world is one of the numerous cultural examples discussed in Communicaid’s intercultural training courses. Understanding how your international colleagues may perceive certain animals can help you ensure you aren’t insensitive and it may even provide you with a good topic for conversation.

The word “unhygienic” in the second paragraph is closest in meaning to     .

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The technology of the North American colonies did not differ strikingly from that of Europe, but in one respect, the colonists enjoyed a great advantage. Especially by comparison with Britain, Americans had a wonderfully plentiful supply of wood.
The first colonists did not, as many people imagine, find an entire continent covered by a climax forest. Even along the Atlantic seaboard, the forest was broken at many points. Nevertheless, all sorts of fine trees abounded, and through the early colonial period, those who pushed westward encountered new forests. By the end of the colonial era, the price of wood had risen slightly in eastern cities, but wood was still extremely abundant.
The availability of wood brought advantages that have seldom been appreciated. Wood was a foundation of the economy. Houses and all manner of buildings were made of wood to a degree unknown in Britain. Secondly, wood was used as fuel for heating and cooking. Thirdly, it was used as the source of important industrial compounds, such as potash, an industrial alkali; charcoal, a component of gunpowder; and tannic acid, used for tanning leather.
The supply of wood conferred advantages but had some negative aspects as well. Iron at that time was produced by heating iron ore with charcoal. Because Britain was so stripped of trees, she was unable to exploit her rich iron mines. But the American colonies had both iron ore and wood; iron production was encouraged and became successful. However, when Britain developed coke smelting, the Colonies did not follow suit because they had plenty of wood and besides, charcoal iron was stronger than coke iron. Coke smelting led to technologic innovations and was linked to the emergence of the Industrial Revolution. In the early nineteenth century, the former colonies lagged behind Britain in industrial development because their supply of wood led them to cling to charcoal iron.

The word "abundant" in paragraph 3 is closest meaning to    -.

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           Criticism
 The volume of traffic in many cities in the world today continues to expand. This (46)......many problems, including serious air pollution, lengthy delays, and the greater risk (47).......accidents. Clearly, something must be done, but it is often difficult to persuade people to change their habits and leave their cars at home.
One possible approach is to make it more expensive for people to use their cars be increasing changes for parking and bringing in tougher fines for anyone who (48)...........the law. In addition, drivers could be required to pay for using particular routes at different times of the day. This system, also known as ‘road pricing’, is already being introduced in a number of cities, using a special electronic card (49) ....... to windscreen of the car.
Another ways of dealing with the problem is to provide cheap parking on the outskirts of the city, and strictly control the number of vehicles allowed into the centre. Drivers and their passengers then use a special bus service for the final stage of their journey.
Of course, the most important (50).............. is to provide good public transport. However, to get people to give up the comfort their cars, public transport must be felt to be reliable, convenient and comfortable, with fares charged at an acceptable level.
(47).................................

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                           Swim, Cycle, and Run
For athletes who like to (1).............. a variety of endurance sports in a single race, triathlons are a great fit. These competitions (2)......... running, cycling, and swimming into one race, and they take place one after the other in a single continuous timed race. Athletes who participate must be in top physical form and have the skills needed to complete each portion of the race.
 Training for triathlons means the athletes have to become proficient not only in the sport required in each stage, but they also have to become familiar with what (3).............  from one to the other does to their bodies. Many inexperienced triathletes are surprised to (4)............... hard it can be to switch from swimming to cycling to running, and how tired their muscles can suddenly feel. One thing all triathletes can agree (5).................is that no one ever told them that running a triathlon would be easy.

(4)..............................

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Singapore  has  a  highly  developed  market-based  economy,  (6)...... historically revolves around extended trade. Along with Hong Kong, South Korea and Taiwan, Singapore is one (7)......... The Four Asian Tigers. The economy depends heavily on exports , refining, imported  goods,  especially  in  manufacturing.  Manufacturing  constituted  26  (8)...... of Singapore's GDP in 2005. The manufacturing industry is well-diversified into electronics, petroleum refining, chemicals, (9).......... engineering and biomedical sciences manufacturing. In 2006. Singapore produced about 10 percent of the world’s foundry water output. Singapore is the busiest port in the world in terms of tonnage shipped. Singapore is the world's fourth largest foreign exchange trading centre after London, New York City (10)................ Tokyo.

(7)..............................

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Singapore  has  a  highly  developed  market-based  economy,  (6)...... historically revolves around extended trade. Along with Hong Kong, South Korea and Taiwan, Singapore is one (7)......... The Four Asian Tigers. The economy depends heavily on exports , refining, imported  goods,  especially  in  manufacturing.  Manufacturing  constituted  26  (8)...... of Singapore's GDP in 2005. The manufacturing industry is well-diversified into electronics, petroleum refining, chemicals, (9).......... engineering and biomedical sciences manufacturing. In 2006. Singapore produced about 10 percent of the world’s foundry water output. Singapore is the busiest port in the world in terms of tonnage shipped. Singapore is the world's fourth largest foreign exchange trading centre after London, New York City (10)................ Tokyo.

(8)..............................

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In the twentieth - century, people depend on unlimited energy to power their everyday lives. A wide range of energy-run devices and modern conveniences are taken for granted, and although it may seem that we will never be in danger of living without those conveniences, the fact is that many supplies of energy are dwindling rapidly. Scientists are constantly searching for new sources of power to keep modern society running. Whether future populations will continue to enjoy the benefits of abundant energy will depend on the success of this search.
Coal, oil, and natural gas supply modern civilization with most of its power. However, not only are supplies of these fuels limited, but they are a major source of pollution. If the energy demands of the future are to be met without seriously harming the environment, existing alternative energy sources must be improved or further explored and developed. These include nuclear, water, solar, wind, and geothermal power, as well as energy from new, nonpolluting types of fuels. Each of these alternatives, however, has advantages and disadvantages.
Nuclear power plants efficiently produce large amounts of electricity without polluting the atmosphere; however, they are costly to build and maintain, and they pose the daunting problem of what to do with nuclear waste. Hydroelectric power is inexpensive and environmentally safe, but impractical for communities located far from moving water. Harnessing energy from tides and waves has similar drawbacks. Solar power holds great promise for the future but methods of collecting and concentrating sunlight are as yet inefficient, as are methods of harnessing wind power.
Every source of energy has its disadvantages. One way to minimize them is to use less energy. Conservation efforts coupled with renewable energy resources, such as a combination of solar, water, wind, and geothermal energy and alternative fuels, such as alcohol and hydrogen, will ensure supplies of clean, affordable energy for humanity's future.

Which of the following can be inferred from the passage?

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 Few people now realize the reality of global warming and its effects on the world’s climate. Many scientists (26)...... the blame for recent natural disasters on the increase in the world’s temperatures and are convinced that, more than ever before, the Earth is  at (27)........ from the forces of the wind, rain and sun. According to them, global warming is making extreme weather events, such as hurricanes and droughts, even more severe and causing sea levels all around the world to rise.
Environmental groups are putting pressure on governments to take action to reduce the amount of carbon dioxide which is given (28)....... by factories and power plants, thus attacking the problems at its source. They are in  (29)........... of more money being spent on research into solar, wind and wave energy devices, which could then replace existing power (30)......... . Some scientists, however, believe that even if we stopped releasing carbon dioxide and other gases into the atmosphere tomorrow, we would have to wait several hundred years to notice the results. Global warming, it seems, is to stay.

(26)............................

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In 1900 the United States had only three cities with more than a million residents-New York, Chicago, and Philadelphia. By 1930, it had ten giant metropolises. The newer ones experienced remarkable growth, which reflected basic changes in the economy. The population of Los Angeles (114,000 in 1900) rose spectacularly in the early decades of the twentieth century, increasing a dramatic 1,400 percent from 1900 to 1930.
A number of circumstances contributed to the meteoric rise of Los Angeles. The agricultural potential of the area was enormous if water for irrigation could be found, and the city founders had the vision and dating to obtain it by constructing a 225-mile aqueduct, completed in 1913, to tap the water of the Owens River. The city had a superb natural harbor, as well as excellent rail connections. The climate made it possible to shoot motion pictures year-round; hence Hollywood not only supplied jobs but also disseminated an image of the good life in Southern California on screens all across the nation. The most important single industry powering the growth of Los Angeles, however, was directly linked to the automobile. The demand for petroleum to fuel gasoline engines led to the opening of the Southern California oil fields, and made Los Angeles North America’s greatest refining center.
Los Angeles was a product of the auto age in another sense as well: its distinctive spatial organization depended on widespread private ownership of automobiles. Los Angeles was a decentralized metropolis, sprawling across the desert landscape over an area of400 square miles.
It was a city without a real center. The downtown business district did not grow apace with the city as a whole, and the rapid transit system designed to link the center with outlying areas withered away from disuse. Approximately 800,000 cars were registered in Los Angeles County in 1930, one per 2.7 residents. Some visitors from the east coast were dismayed at the endless urban sprawl and dismissed Los Angeles as a mere collection of suburbs in search of a city. But the freedom and mobility of a city built on wheels attracted floods of migrants to the city.

What is the passage mainly about?

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Throughout history, women have had responsiblity for healing the sick. However, it is only in ccomparative recent times that they have been allowed to train as doctors at medical schools in Britain. Yet in that short time, they have (61)....... an enormous contribution to modern medicine.
The first female doctors were nuns (62)........._ gave advice about diseases and (63)......... and prepared medicnes. In ancient Rome, women healers were considered skillful and respected. In Britain, for centuries, male doctors were suspicious of women who pratised medicine (64) ..........and in 1512 a law was passed making it illegal for them to do so. Women coulnd’t study medicine at universities (65).......... the 19th century and they only began to gain equality with male doctors in the 20th century.
(62)...........................

On Friday, April 14, the city hall’s electricity is scheduled to be shut down at 7 A.M. and restored at 6 P.M. The building ---131--- for the day. During the power outage, the emergency lighting system will be upgraded. ---132---, all circuit panels will be replaced to bring them into compliance with current safety codes.---133--- exiting city hall offices on Thursday, please disconnect all desktop computers, wireless servers, and other computer-related equipment. Furthermore, employees are asked to remove any personal contents from the kitchenette.---134---.Please direct questions or concerns to the director of building maintenance.

131.....................

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   For centuries, time was measured by the position of the sun with the use of sundials. Noon was recognized when the sun was the highest in the sky, and cities would set their clock by this apparent solar time, even though some cities would often be on a slightly different time. Daylight Saving Time (DST), sometimes called summer time, was instituted to make better use of daylight. Thus, clocks are set forward one hour in the spring to move an hour of daylight from the morning to the evening and then set back one hour in the fall to return to normal daylight.

   Benjamin Franklin first conceived the idea of daylight saving during his tenure as an American delegate in Paris in 1984 and wrote about it extensively in his essay, "An Economical Project." It is said that Franklin awoke early one morning and was surprised to see the sunlight at such an hour. Always the economist, Franklin believed the practice of moving the time could save on the use of candlelight, as candles were expensive at the time.

   In England, builder William Willett (1857–1915) became a strong supporter for Daylight Saving Time upon noticing blinds of many houses were closed on an early sunny morning. Willet believed everyone, including himself, would appreciate longer hours of light in the evenings. In 1909, Sir Robert Pearce introduced a bill in the House of Commons to make it obligatory to adjust the clocks. A bill was drafted and introduced into Parliament several times but met with great opposition, mostly from farmers. Eventually, in 1925, it was decided that summer time should begin on the day following the third Saturday in April and close after the first Saturday in October.

   The U.S. Congress passed the Standard Time Act of 1918 to establish standard time and preserve and set Daylight Saving Time across the continent. This act also devised five time zones throughout the United States: Eastern, Central, Mountain, Pacific, and Alaska. The first time zone was set on "the mean astronomical time of the seventy-fifth degree of longitude west from Greenwich" (England). In 1919, this act was repealed.

   President Roosevelt established year-round Daylight Saving Time (also called War Time) from 1942–1945. However, after this period, each state adopted its own DST, which proved to be disconcerting to television and radio broadcasting and transportation. In 1966, President Lyndon Johnson created the Department of Transportation and signed the Uniform Time Act. As a result, the Department of Transportation was given the responsibility for the time laws. During the oil embargo and energy crisis of the 1970s, President Richard Nixon extended DST through the Daylight Saving Time Energy Act of 1973 to conserve energy further. This law was modified in 1986, and Daylight Saving Time was reset to begin on the first Sunday in April (to spring ahead) and end on the last Sunday in October (to fall back).

Which of the following would be the best title for this passage?

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On March 15, Dunes View Middle School held a contest for school bands. Student bands tried  out for the opportunity to perform at the school picnic, which will be held at the end of June. The winner of the contest was the band called Four Square. "We're very proud that we won the contest  and are excited to perform at the picnic," says Peter Zandt, who plays the guitar in the band. "And     since we hope to perform someday at other local places, like restaurants and parks, this will be  a  great first step."
The contest was the creation of music teacher Mr. Lopez and drama teacher Ms. Cho. The two thought of the idea while discussing recent years' school picnics. "The picnic is one of the biggest events of the year, but it has become a bit formulaic ," said Ms. Cho. "The activities are the same every year. We thought that a performance by a student band would make the school picnic more interesting and fun." Mr. Lopez, Ms. Cho, and three other teachers judged the contest, which took place  in the gym. Eight student bands signed up to audition. The bands varied in their musical forms: there  were several rock bands, a folk band, and even a jazz band. "I'm disappointed that my band didn't win,  but I think the judges made the right choice," says student Marisol Varga, a member of the folk trio called The Bell Girls. "Four Square is really excellent."
To see if the bands could present a wide range of musical skills, the teachers asked them  each to prepare two songs: one song with original words, and another in which students played instrumental music only. The judges finally chose the band Four Square as the winner of the contest. Four Square is a rock band with an unusual twist: it includes a violin player! The members of Four Square write their own songs and practice three times a week after school. Students and teachers agreed that the band competition was a big success. All are  looking forward  to the school picnic in June.

According to the article, what does the band Four Square hope to do in the future?

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Singapore  has  a  highly  developed  market-based  economy,  (6)...... historically revolves around extended trade. Along with Hong Kong, South Korea and Taiwan, Singapore is one (7)......... The Four Asian Tigers. The economy depends heavily on exports , refining, imported  goods,  especially  in  manufacturing.  Manufacturing  constituted  26  (8)...... of Singapore's GDP in 2005. The manufacturing industry is well-diversified into electronics, petroleum refining, chemicals, (9).......... engineering and biomedical sciences manufacturing. In 2006. Singapore produced about 10 percent of the world’s foundry water output. Singapore is the busiest port in the world in terms of tonnage shipped. Singapore is the world's fourth largest foreign exchange trading centre after London, New York City (10)................ Tokyo.

(6)..............................

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Less than a year ago marketing director, David Smith, 33 was behaving like a secet agent. He used to secretly taped all his conversations, he refused to sign his name and he would ask his secretary to check all his emails. Anything he wrote was photocopied and kept as “evidence”. But David isn’t mad, or even mildly eccertric. He suffers from ‘resposibility OCD’, one of more common form of obsessive compulsive disorder, or OCD, as it is usually known.
OCD is now recognized as the second most prevalent mental-health problem, after depression – and the number of reported cases is soaring. Experts estimate that 2% - 3% of the population suffer from the full-blown syndrome, with as many as one in five suffering from a milder form.
OCD sufferers are tortured by obsessional thoughts, such as worrying that their hands are contaminated by germs. The terrible anxiety is only relieved by performing a particular set of behaviours. Unfortunately, any sense of relief is short-lived, which is why the behaviour must be repeated again and again. OCD sufferers know their behavior is irrational, yet feel powerless to stop.
Common treatments are either antidepressants or behavioral therapy with a psychologist, but only 60% of patients show some improvement. However, a new treatment from America is bringing fresh hope to sufferers.
One of the OCD gurus and neuropsychiatrists, Jeffrey Schwartz, has designed the Four Steps program which employs meditation teachniques with the aim of teaching sufferers to manage their symptoms by themselves. “The goal is to learn to override false brain messages”, explains Schwartz.
There are different theories about what causes the disorder. Most experts recognize a genetic element that can be triggered by a stressful event. Schwartz believes that the OCD ‘worry circuit’ is a
direct result of faulty brain chemistry. ‘When someone experiences an OCD thought, one part of the brain knows quite clearly that the hand are not dirty’, explains Schwartz ‘Some part of the brain is standing apart from the symptoms, reflecting on the sheer bizarreness of it all. The objective is to harness this impartial spectator so that patients can use this healthy part of their brain to resist the compulsions.’
David Smith is delighted with the results of Schwartz’s treatment. ‘Now I can sign cheques without a problem’, he says brightly. ‘And I don’t photocopy them either. OCD used to feel like a huge stigma, but I don’t feel handicapped by it any more. You just deal with it.’

What does the word ‘their’ in paragraph 5 refers?

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Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants.
The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only  minuscule amounts in his excreta and through evaporation from his respiratory tract.
Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals. Could kangaroo rats somehow store water in their bodies and slowly utilize these resources in the long periods when no free water is available from dew or rain? The simplest way to settle this question was to determine the total water content in the animals to see if it decreases as they are kept for long periods on a dry diet. If they slowly use up their water, the body should become increasingly dehydrated, and if they begin with a store of water, this should be evident from an initial high water content. Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water itent in their bodies, which remained at 66.3 % to 67.2 % during this period. This is very close to the water content of dry-fed animals (66.5 %), and the availability of free water, therefore, did not lead to any “storage” that could be meaningful as a water reserve. This makes it reasonable to conclude that physiological storage of water is not a factor in the kangaroo rat’s ability to live on dry food.

Which of the following is NOT a source of water for the desert animals?