Read the passage below and choose one correct answer for each question.

Books which give instructions on how to do things are very popular in the United States today. Thousands of these How-to books are useful: in fact, there are about four thousand books with titles that begin with the words 'How-to". One book may tell you how to earn more money, another may tell you how to save or spend it and another may explain how to give your money away. Many How-to books give advice on careers. They tell you how to choose a career and how to succeed in it. If you fail, however, you can buy the book “How to Turn Failure into Success”. If you would like to become very rich, you can buy the book “How to Make a Millionaire”. If you never make any money at all. you may need abook called “How to Live on Nothing”. One of the most popular types of books is one that helps you with personal problems. If you want to have a better love of life, you can read “How to Succeed in Love Every Minute of Your Life”. If you are tired of books on happiness,  you may prefer books which give step-by-step instructions on how to redecorate or enlarge a house. Why have How-to books become so popular? Probably because life has become so complex. Today people have far more time to use, more choices to make, and more problems to solve. How-to books help people deal with modern life.

From the first paragraph, we know How-to books are________.

Let children learn to judge their own work. A child learning to talk does not learn by being corrected all the time. If corrected too much, he will stop talking. He notices a thousand times a day the difference between the language he uses and the language those around him use. Bit by bit, he makes the necessary changes to make his language like other people’s. In the same way, children learn all the other things they learn to do without being taught - to talk, run, climb, whistle, ride a bicycle - compare their own performances with those of more skilled people, and slowly make the needed changes. But in school we never give a child a chance to find out his mistakes for himself, let alone correct them. We do it all for him. We act as if we thought that he would never notice a mistake unless it was pointed out to him, or correct it unless he was made to. Soon he becomes dependent on the teacher. Let him do it himself. Let him work out, with the help of other children if he wants it, what this word says, what the answer is to that problem, whether this is a good way of saying or doing this or not.
If it is a matter of right answers, as it may be in mathematics or science, give him the answer book. Let him correct his own papers. Why should we teachers waste time on such routine work? Our job should be to help the child when he tells us that he can’t find the way to get the right answer. Let’s end all this nonsense of grades, exams, and marks. Let us throw them all out, and let the children learn what all educated persons must someday learn, how to measure their own understanding, how to know what they know or do not know.
Let them get on with this job in the way that seems most sensible to them, with our help as school teachers if they ask for it. The idea that there is a body of knowledge to be learnt at school and used for the rest of one’s life is nonsense in a world as complicated and rapidly changing as ours. Anxious parents and teachers say, “But suppose they fail to learn something essential, something they will need to get on in the world?” Don’t worry! If it is essential, they will go out into the world and learn it.

According to the first paragraph, what basic skills do children learn to do without being taught?

Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed. Although bioluminescence is a relatively complicated process, it can be reduced to simple terms. Living light occurs when luciferin and oxygen combine in the presence of luciferase. In a few cases, fireflies the most common, an additional compound called ATP is required.
The earliest recorded experiments with bioluminescence in the late 1800s are attributed to Raphael Dubois, who extracted a luminous fluid from a clam, observing that it continued to glow in the test tube for several minutes. He named the substance luciferin, which means “the bearer of life”. In further research, Dubois discovered that several chemicals were required for bioluminescence to occur. In his notes, it was recorded that a second important substance, which he called luciferase, was always present. In later study of small, luminous sea creatures, Newton Harley concluded that luciferin was composed of carbon, hydrosen, and oxygen, which are the building blocks of all living cells. He also proved that there are a variety of luciferin and luciferase, specific to the plants and animals that produce them.
Much remains unknown, but many scientists who are studying bioluminescence now believe that the origin of the phenomenon may be traced to a time when there was no oxygen in the Earth’s atmosphere. When oxygen was gradually introduced to the atmosphere, it was actually poisonous to life forms, plants and animals produced light to use up the oxygen in a gradual but necessary adaptation. It is speculated that millions of years ago, all life may have produced light to survive. As the millennia passed, life forms on Earth became tolerant of, and finally dependent on oxygen, and the adaptation that produced bioluminescence was no longer necessary, but some primitive plants and animals continued to use the light for new functions such as mating or attracting prey.

The word “it” refers to:

Let children learn to judge their own work. A child learning to talk does not learn by being corrected all the time. If corrected too much, he will stop talking. He notices a thousand times a day the difference between the language he uses and the language those around him use. Bit by bit, he makes the necessary changes to make his language like other people’s. In the same way, children learn all the other things they learn to do without being taught - to talk, run, climb, whistle, ride a bicycle - compare their own performances with those of more skilled people, and slowly make the needed changes. But in school we never give a child a chance to find out his mistakes for himself, let alone correct them. We do it all for him. We act as if we thought that he would never notice a mistake unless it was pointed out to him, or correct it unless he was made to. Soon he becomes dependent on the teacher. Let him do it himself. Let him work out, with the help of other children if he wants it, what this word says, what the answer is to that problem, whether this is a good way of saying or doing this or not.
If it is a matter of right answers, as it may be in mathematics or science, give him the answer book. Let him correct his own papers. Why should we teachers waste time on such routine work? Our job should be to help the child when he tells us that he can’t find the way to get the right answer. Let’s end all this nonsense of grades, exams, and marks. Let us throw them all out, and let the children learn what all educated persons must someday learn, how to measure their own understanding, how to know what they know or do not know.
Let them get on with this job in the way that seems most sensible to them, with our help as school teachers if they ask for it. The idea that there is a body of knowledge to be learnt at school and used for the rest of one’s life is nonsense in a world as complicated and rapidly changing as ours. Anxious parents and teachers say, “But suppose they fail to learn something essential, something they will need to get on in the world?” Don’t worry! If it is essential, they will go out into the world and learn it.

The author fears that children will grow up into adults who are ________.

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.

Since the invention of the Internet, the world has become a different place. People are sending messages, apparently up to 60 billion a day, and it usually takes only seconds to deliver them. (1) _________are we now forgetting how to communicate face-to-face?

Without a doubt there are (2) _________ challenges, but there are also examples of when the Internet has changed someone's life for the better. Look at Tara Taylor's case, a mother (3) ___________ lives in the USA: when she uploaded a photo of her daughter to Facebook, a facefriend (4) ______a problem with one of the child's eyes, so Tara took her to the doctor. It turned out that the girl had a rare disease, but her sight was saved! The story of communication is, in many (5) _______, the story of the human race: we have always shared knowledge and built relationships, whatever means of communication we use.

(Adapted from High Note)

(2) ________

 Choose the item among A, B, C or D that best answers the question about the passage:

"Books which give instructions on how to do things are very popular in the United States today. Thousands of these How-to books are useful: in fact, there are about four thousand books with titles that begin with the words “How to”. One book, may tell you how to earn more money, another may tell you how to save or spend it, and another may explain how to give your money away.
 Many How-to books give advice on careers. They tell you how to choose a career and how to succeed in it. If you fail, however, you can buy the book “How to Turn Failure into Success”. If you would like to become very rich, you can buy the book “How to Make a Millionaire”. If you never make any money at all, you may need a book called “How to Live on Nothing”.
 One of the most popular types of books is one that helps you with personal problems. If you want to have a better love of life, you can read “How to Succeed in Love every Minute of Your Life”. If you tired of books on happiness, you may prefer books which give step-by-step instructions on how to redecorate or enlarge a house.
 Why have How-to books become so popular? Probably because life has become so complex. Today people have far more free time to use, more choices to make, and more problems to solve. How-to books help people deal with modern life."

2. The passage tells us that How-to books sell well on how ………

In “Cerealizing America”, Scott Bruce and Bill Crawford remark that the cereal  industry uses 816 million pounds of sugar per year. Americans buy 2.7 billion  packages of breakfast cereal each year. If (1) _______ end to end, the empty  cereal boxes from one year's consumption would (2) _______ to the moon and back. One point three (1.3) million advertisements for cereal are broadcast on  American television every year at a(n) (3) _______ of $762 million for airtime.  Only automobile manufacturers spend more money on television advertising  than the makers of breakfast cereal. (4) _______ of the boxed cereals found in  supermarkets contain large amounts of sugar and some contain more than 50%  sugar. Cereal manufacturers are very clever in their marketing, making many  cereals appear much healthier than they really are by “fortifying” them with vitamins and minerals. Oh, (5) ______ – you now have vitamin-fortified sugar! Before you eat any cereal, read the ingredient list and see how (6) _______  sugar appears on the ingredient list. Then check the “Nutrition facts” panel. 
There are actually only a small handful of national commercially-branded cereals  that are made (7) _______ whole grains and are sugar-free. If you shop at a health  food store instead of your local supermarket, you (8) _______ to find a healthy,  whole grain, sugar-free (or very low sugar) cereal. But (9) _______! Some of the  health food store boxed cereals are sweetened with fruit juice or fructose.  Although this may be an improvement (10) _______ refined white sugar, this can  really skyrocket the calories. 

10..................

Read the passage below and choose one correct answer for each question.

Books which give instructions on how to do things are very popular in the United States today. Thousands of these How-to books are useful: in fact, there are about four thousand books with titles that begin with the words 'How-to". One book may tell you how to earn more money, another may tell you how to save or spend it and another may explain how to give your money away. Many How-to books give advice on careers. They tell you how to choose a career and how to succeed in it. If you fail, however, you can buy the book “How to Turn Failure into Success”. If you would like to become very rich, you can buy the book “How to Make a Millionaire”. If you never make any money at all. you may need abook called “How to Live on Nothing”. One of the most popular types of books is one that helps you with personal problems. If you want to have a better love of life, you can read “How to Succeed in Love Every Minute of Your Life”. If you are tired of books on happiness,  you may prefer books which give step-by-step instructions on how to redecorate or enlarge a house. Why have How-to books become so popular? Probably because life has become so complex. Today people have far more time to use, more choices to make, and more problems to solve. How-to books help people deal with modern life.

If you often read “How-to books”, you________. 

Read the following the passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrasethat best fits each of the numbered blanks from 31 to 35.
From the next year, every student in their final rear at our school will study for a compulsory Diploma of Practical Achievement. This will be in addition to the normal examinations. Up to now, the course has been optional, but from now on every student must (31)        it.
The aim is to (32)   students with "life skills", which the Diploma divides into eight categories. These cover a range of things relevant to life beyond school, from sending an e-mail to giving presentation  to  an  audience.  Under  the  heading     "survival",  (33)      ,  students   can learn  car mainternance, first aid and cooking. We have discovered that many students cannot do simple things such as mend a puncture or boil an egg. At the other extreme, the Diploma includes such things as how to design a webpage and how to cope if someone has a heart attack. It has been called a " Diploma in Common Sense".
On the course, students will not be taught in the traditional (34)  
  , but rather will be guided and encouraged to do things for themselves. This is above all a practical "hand-on" course. To a greater or lesser extent, good schools have always tried to (35)        these skills. Unfortunately, students have not always shown much interest because such skills are not directly related to passing exams for higher education. We hope this will change now that we have a proper course that will lead to a recognised diploma.
(33)..................

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 from 31 to 35.
Back in the 1960s and 1970s, the world was becoming more aware of the destructive effects of industry (31)________ the environment and people were starting to think seriously about ways of protecting the environment. One man who was particularly affected by this subject was Gerard Morgan-Grenville. As Morgan-Grenville travelled round earning his living as a gardener, he noticed signs of the damage that was being done to the countryside around him. It wasn't long before Morgan-Grenville decided that he had to do something about this situation. He felt that if people could be shown a better way of living then maybe they would be interested enough to try to protect their (32)________ environment.
Mr. Morgan-Grenville decided to set up a   project (33)________ would prove what was happening  to our surroundings and what could be done about it. So, in 1975, Morgan-Grenville created the Centre for Alternative Technology (CAT) in a village in Wales.
The main aim of CAT is to search for an ecologically better way of living by using technology which (34)________ no harm to the environment. One of the most important things CAT did initially was to explore  and demonstrate a wide range of techniques and to point out which ones had the least destructive results on the world around us. (35)________ , CAT provides information and advice to people all over Britain and all over the world. If more and more individuals are informed about how much damage our modern lifestyle is causing to the planet, maybe more of them would be prepared to look for practical solutions to environmental problems.
(33).....................

Let children learn to judge their own work. A child learning to talk does not learn by being corrected all the time. If corrected too much, he will stop talking. He notices a thousand times a day the difference between the language he uses and the language those around him use. Bit by bit, he makes the necessary changes to make his language like other people’s. In the same way, children learn all the other things they learn to do without being taught - to talk, run, climb, whistle, ride a bicycle - compare their own performances with those of more skilled people, and slowly make the needed changes. But in school we never give a child a chance to find out his mistakes for himself, let alone correct them. We do it all for him. We act as if we thought that he would never notice a mistake unless it was pointed out to him, or correct it unless he was made to. Soon he becomes dependent on the teacher. Let him do it himself. Let him work out, with the help of other children if he wants it, what this word says, what the answer is to that problem, whether this is a good way of saying or doing this or not.
If it is a matter of right answers, as it may be in mathematics or science, give him the answer book. Let him correct his own papers. Why should we teachers waste time on such routine work? Our job should be to help the child when he tells us that he can’t find the way to get the right answer. Let’s end all this nonsense of grades, exams, and marks. Let us throw them all out, and let the children learn what all educated persons must someday learn, how to measure their own understanding, how to know what they know or do not know.
Let them get on with this job in the way that seems most sensible to them, with our help as school teachers if they ask for it. The idea that there is a body of knowledge to be learnt at school and used for the rest of one’s life is nonsense in a world as complicated and rapidly changing as ours. Anxious parents and teachers say, “But suppose they fail to learn something essential, something they will need to get on in the world?” Don’t worry! If it is essential, they will go out into the world and learn it.

The passage suggests that learning to speak and learning to ride a bicycle are ________.

Read the following passage and choose the best answer for each blank.

AUDIOBOOKS - BOOKS ON CASSETTE

In the modern world, there is a wealth of leisure activities to choose from. Entertainment industries (26)________ for your leisure time. You can watch TV, listen to music, go to an art gallery or concert or, of course, read a book. Sometimes it seems that reading is (27)________because, even if you're a fast reader, it can take a (28)________amount of time to finish a novel, for example. But in the (29)________world, time is something that can be in short supply. Book publishers haven't been (30)________to realise this and are now selling a product which needn't (31)________as much of your time but still tells you an excellent story. The new product is the audiobook -cassette recordings of shortened novels, often read by well-known personalities or the authors themselves. Audiobooks are (32)________new but people are becoming more aware of them and sales are increasing all the time. One of the attractions of audiobooks is that they're (33)________listening to the radio. You can listen to what you want when you want, and you won't ever (34)________anything. Much of their appeal lies in their flexibility. They (35)________you to do other things while you're listening, such as driving or doing the housework. For some people, audiobooks can be a much more enjoyable way of gaining knowledge than reading.

(28)________

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.

All living things require energy to do the work necessary for survival and reproduction. But what is energy? Energy is simply the ability to do work, (1) ......... work is done when a force moves an object. Let's consider your own needs for a moment. You need energy to turn on and turn off your computer. You need energy to (2).......... of bed in the morning. And, yes, you need energy to reproduce. So where does energy come from and how do we use it? On Earth, energy ultimately comes from the sun. Plants use the sun's energy to make sugar. Organisms, in turn, use sugar as a (3) ........... of energy to do work.

Plants use energy from sunlight to make sugar and oxygen from carbon dioxide and water. The process by which carbon dioxide and water are (4) .......... to sugar and oxygen using sunlight is referred to as photosynthesis. This is an endergonic reaction, meaning energy is required by the reaction. Specifically, energy is required to put the carbon dioxide and the water molecules together to form sugar. Sun (5).........the energy needed to drive photosynthesis, and some of the energy used to make the sugar is stored in the sugar molecule.

(study.com/energy-and-life-the–transformation-of-energy-in-living)

(1) __________

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word(s) for each of the blanks.

The relationship between students and teachers is less formal in the USA than in many other countries. American students do not stand up when their teachers (1) _______the room. Students are encouraged to ask questions during class, to stop in the teacher’s office for extra help, and to phone if they are absent. Most teachers (2) _________ students to enter class late or leave early if necessary. (3) ______the lack of formality, students are still expected to be polite to their teachers and classmates.

When students want to ask questions, they usually (4) _______ a hand and wait to be called on. When a test is being given, talking to a classmate is not only rude but also risky. Most American teachers consider that students who are talking to each other (5) _______ a test are cheating.

(4) _________

Read the text below and decide which answer (A,B,C, or D) best fits each space.
Postsecondary institutions and private schools are corporations under U.S. law.  They are approved to operate as non-profit, for-profit, or public corporations (1)  _______ education and training. Increasingly, state authorities are requiring  approved educational providers to apply (2) _______ and receive accreditation  as a condition of final and continued approval. 
As corporate entities, U.S. institutions are internally self-governing and are (3)  _______ to make property, facilities, equipment, and utilities transactions; make  their own personnel decisions; decide whom to admit to study and to graduate;  (4) _______ their own funds from outside sources; enter into contracts and  compete for grants; and do most of the other things that corporations do.  Institutions compete (5) _______ one another for students, research funding,  faculty, and other benefits. Public institutions may compete within the same  state or territory for budget appropriations. It is the corporate nature of  institutions and the competition within the system that (6) _______ Americans  to refer to the concept of the educational or academic marketplace - an important distinctive element of the way U.S. education is organized. 
Some institutions are governed (7) _______ under multi-campus arrangements.  These include most local public schools (governed by school districts) and many  state community college and university systems. Whether single- or multi campus, institutional corporations (8) _______ by boards of citizens, both  alumni and non- alumni, who are ultimately responsible for all operations. They  appoint senior (9) _______, such as principals, headmasters, presidents, and  deans; and approve the actions taken (10) ______ their name. 

10............................

In “Cerealizing America”, Scott Bruce and Bill Crawford remark that the cereal  industry uses 816 million pounds of sugar per year. Americans buy 2.7 billion  packages of breakfast cereal each year. If (1) _______ end to end, the empty  cereal boxes from one year's consumption would (2) _______ to the moon and back. One point three (1.3) million advertisements for cereal are broadcast on  American television every year at a(n) (3) _______ of $762 million for airtime.  Only automobile manufacturers spend more money on television advertising  than the makers of breakfast cereal. (4) _______ of the boxed cereals found in  supermarkets contain large amounts of sugar and some contain more than 50%  sugar. Cereal manufacturers are very clever in their marketing, making many  cereals appear much healthier than they really are by “fortifying” them with vitamins and minerals. Oh, (5) ______ – you now have vitamin-fortified sugar! Before you eat any cereal, read the ingredient list and see how (6) _______  sugar appears on the ingredient list. Then check the “Nutrition facts” panel. 
There are actually only a small handful of national commercially-branded cereals  that are made (7) _______ whole grains and are sugar-free. If you shop at a health  food store instead of your local supermarket, you (8) _______ to find a healthy,  whole grain, sugar-free (or very low sugar) cereal. But (9) _______! Some of the  health food store boxed cereals are sweetened with fruit juice or fructose.  Although this may be an improvement (10) _______ refined white sugar, this can  really skyrocket the calories. 

6......................

Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question. 
The world’s oldest post office, which has been operating in Sanquhar, Scotland, for more than 300 years, faces an uncertain future. Current owner and stamp collector, Manzoor Alam, and his wife, Nazra, have been forced to put the business and its accompanying cottage on the market due to ill health.
The Alams are “heartbroken” to leave the post office, and are concerned that if a buyer cannot be found its rich history could be lost. “It was my husband who was always the one most interested in stamps and the postal service but over the last few years of working here it has grown on me too,” said Mrs Alam. The couple are the post office’s 16th postmasters, and if they become the last, the title will fall to a Stockholm branch, which opened in 1720.
Dumfries and Galloway councillor, Andrew Wood, said lots of rural areas were struggling to keep their post offices open. He said it would be a “sad day” if the business folded. “I was wondering if the community could arrange a buyout but it shouldn’t come down to that,” he said. “We’re a wealthy country and should be able to have them in good-sized towns.”
The property is on the market for £275,000, and includes a three-bed cottage with two bathrooms, a large living room, and garden with outbuildings. Agent Humberstones suggests the outbuilding could be a holiday let, tea room or postal museum, as Mr Alam had planned. “My ambition is to promote the rich heritage of the past by establishing a postal museum — the only one in Scotland — and combining it with a modern business, securing this wonderful post office for future generations,’” he had said when he took on the business.

According to paragraph 4, what is NOT included in the premises?

Fill in each numbered blank with one suitable word or phrase.

If you want to prepare yourself for great achievement and have more to (1) ______ to your education or your work, try reading more books. (2) ______ up some of the interestingly informative books and search for well-researched material that can help you grow. We should (3) ______ our children to read more books and (4) ______ less time watching TV. Some people have commented that this is inconsistent. "Why is the written word a superior way to get information than television?" That is (5) ______ interesting point of view worth further (6) ______. Reading is a skill that is in much greater demand than the demand for watching TV. There are no jobs that (7) ______ a person to be able to watch TV but reading is an integral part of many jobs. The written word is an incredibly flexible and efficient way of communication. You can write something down and, in no time, it can be (8) ______ to many different people. Not only that, we can (9) ______ vast amounts of information through reading in a very short time. A good reader can acquire more information in reading for two hours than someone watching TV can acquire in a full day. You are able to gain a lot of information quickly because you are a fast reader with good (10) ______ skills. It will save you massive amounts of time and you will be able to assimilate vast quantities of information.

(2) ______

There are books with fairy tails in many countries. Often the same stories are known and repeated in many languages. Some of the things that happens in these stories are remarkable, although not as remarkable as things that are truly happening in medicine and science today.
Most fairy tails begin with “Once upon a time” and end with “They lived happily ever after”, so we will begin in the same way.
Once upon a time there was a girl calls Cinderella who did all the work in the kitchen while her lazy sister did nothing.
One night, her sister went to a ball at the palace. Cinderella was left home, very sad. After a time her fairy godmother appeared and told Cinderella that she could go to the ball- but to return home by midnight.
So she went to the ball in a beautiful dress in a wonderful coach. She danced with the prince but at midnight she ran back home, leaving one of her shoes on the floor. The prince wanted to see her again and went to every house in the capital until he found that the shoe was the right size for Cinderella. She and the price were married and lived happily ever after.

According to the passage, things truly happening in medicine and science today are_________ things that happenes in some fairy tails

Read the following passage and mark the letter A, B, C, or D to indicate the word that best fits each of the blanks from 6 to 10.
HOLIDAYS
We've just come back exhausted after a two-week holiday in France. We were really stupid. On the last day we drove non-stop from Marseille to Calais- we should have (6)           our journey in Lyon or Paris.   As if that wasn't enough, the sea was so rough in the English Channel that the (7)         took three hours instead of one and a half. Next year we've decided we're going on a cheap (8)           holiday to Italy. It sounds marvellous- the cost of the flight, the hotel and all our meals are (9)             in the price. While we're in Rome we'll be going on a guided tour of the Coliseum. The last time I was in Italy, I was on a business trip - I can't say I saw many of the famous tourist (10)                 on that occasion.
(9)..............................

Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds - any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.
The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.
In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world’s weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.
The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

The word “innate” is closest in meaning to ________.