Today there are 6.4 billion people on the earth. By the year 2050 there may be 12.5 billion . There are a lot of people to feed. We need more and more food.
One way to produce more food is growing stronger plants. For thousands of years, farmers have made plants better. Every season, they pick the best plants for the next season. It works very slowly. Since 1983, scientists have been able to change plants more quickly by changing their genetic(遗传的) material. Foods from plants grown in this way are called genetically modified(改变的) foods, or GM foods.
By changing the genetic material of a plant, it is possible to make new plants. They make plants which are strong against plant diseases. They can also help in our diseases; a kind of rice is being prepared , for example , which stops people becoming blind.
Rich countries produce GM foods because they are easy to grow and bring in more money. Poor countries are interested in them because they help produce more food.
GM plants are not natural. No one knows how good or bad they are,. Making GM foods is only one way of feeding people in 2050. There are strong feelings against them, because they are unnatural. They may feed people , then hurt them or their children later. But both rich and poor countries are interested in their use, and they are not going to go away. In 2050, we may think differently about them.
【小题1】GM foods are made by
A. farmers B. workers C. scientists D plants
【小题2】What are the good things about GM foods ?
A. They make plants strong against diseases. B. They are unnatural.
C. They can help in human diseases. D Both A and C.
【小题3】GM foods .
A. are a quick way to produce food B. grow in the wild
C. are safe D are grown only in rich countries
【小题4】Why do some people not like GM foods?
A. They are not useful. B. They are not helpful.
C. They are not natural. D They are not cheap.
【小题5】From the passage we know that .
A.GM foods will disappear one day in the future |
B.GM foods will not disappear in the future |
C.People will not be interested in GM foods. |
D.People will have to stop using GM foods |
【小题1】C
【小题1】D
【小题1】A
【小题1】C
【小题1】B
解析1. C 根据Since 1983, scientists have been able to change plants more quickly by changing their genetic(遗传的) material可知是由科学家制造出来的,选C。
2. D 此题讲的是这些遗传基因改变的食物的优点,定位到第三段。从They make plants which are strong against plant diseases. They can also help in our diseases可知A和C都是其中的一个方面,故选D。
3. A 细节题的考查。从because they help produce more food可知它们能够帮助产生更多的食物,故是一种快速生产食物的途径,故选A。
4. C 本题问的是人们不喜欢的原因,从There are strong feelings against them, because they are unnatural人们强烈反对是因为它们不是自然的,故选C。
5. B 此题是推测类型的题。根据文章倒数第二句But both rich and poor countries are interested in their use, and they are not going to可知它们不会消失(go away),相当于disapper,故选B。
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单词拼写: 每个空格限填一词 (每空1分;共10分)
Mr Black comes from the USA.He lives in New York.He is a 【小题1】(医生).He works at night.And he 【小题2】_(睡觉) in the day.He is a little___【小题3】_(害羞的).He likes to take a __【小题4】_(散步) in a _【小题5】_(安静的) place.He likes 【小题6】(狮子).He often goes to the zoo.His wife, Mrs Black is a nurse.It’s _【小题7】_(炎热的) today.There is a pool【小题8】(在……之后)the house.Look! She is swimming in the pool.Oh, she is 【小题9】(饥饿的) now.Mr Black is 【小题10】(煮)dinner.They’re very happy.
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There is a park near our school. We can see many trees and flowers there. We can see a hill behind the park, too. At the foot of the hill we can see a river. There are some boats on it. It is Sunday today. There are many Young Pioneers(少先队员) in the park. Some are walking and singing. Some are dancing or playing games. Ann and her sister Kate are flying a kite. Tom and his brother Sam are throwing a frisbee (扔飞盘). Their parents are sitting under a tree. All the family are having a good time.
1.Where is the hill?
A.Across from the river. B.Behind the school.
C.In front of the park D.Behind the park.
2.Who’s Sam? He is ______.
A.Kate’s brother B.Ann’s brother C.Tom’s brother D.Jim’s brother
3.Do their parents come to the park, too ?
A.Yes, they do. B.No, they don’t. C.Yes, they are. D.No, they aren’t.
4.What are Ann and Kate doing?
A.Singing B.Flying a kite C.Working D.Throwing a frisbee
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A.Near our school. B.Behind the park.
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The San Diego Zoo has been a lovely home for giant pandas since two of the black-and-white bears came to visit in 1987. This week there was snow in San Diego—well, at least for a lucky group of giant pandas.
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Today there are 44 giant pandas living in zoos outside of China, where the bears' only natural home is. As just 1,600 pandas are thought to be left in the wild, researchers insist that captive breeding is an important way to study and protect the endangered pandas. Not only because of the habitat loss from human activities and low reproductive rates(繁殖率), giant pandas' survival is also affected by climate change. A study showed that global warming could kill much of the bears' main food, bamboo, over the next century.
1.Why was the snow blown into the San Diego Zoo's panda area?
A.To stop the bamboos from dying.
B.To give the pandas a chance to play.
C.To help the pandas live in their natural habitat.
D.To make Xiao Liwu happy.
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A.Wife and husband.
B.Father and daughter.
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A.The loss of habitat.
B.Low reproductive rates.
C.Human research.
D.Climate change.
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B.Giant pandas in danger
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5.Which of the following is true according to the passage?
A.Captive breeding is the most useful way to protect giant pandas.
B.More than 44 giant pandas live in zoos outside of China now.
C.China is the only natural home of giant pandas.
D.Xiao Liwu was afraid of being thrown in the snow by mama.
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A rabbit is running into his hole. You may ask, “What happened?”
Well, when a rabbit sees something dangerous, it runs away. Its tail moves up and down as it runs. When other rabbits see this tail moving up and down, they ran, too. They know there is danger. The rabbit has told them something without making a sound. It has given them a signal.
Many other animals use this kind of language. When a bee finds some food, it goes back to his home. It can’t tell the other bees where the food is by speaking to them, but it does dance in the air. This tells the bees where the food is.
But animals say things by making sounds. A dog barks, for examples, when a stranger comes near. A cat purrs(发出呼噜呼噜的声音) when pleased. Some birds make several different sounds, each with its own meaning.
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No one knows how man learned to make words. Somehow he learned to make them. As centuries went by, he made more and more new words. This is what we mean by language.
People in different countries made different kinds of words. Today there are about fifteen hundred different languages in the world. A very large English dictionary, for examples, contains four or five hundred thousand words. But we don’t know all these. The words we know are called vocabulary. We should try to make our vocabulary larger. Read as many books as possible. When we met a new word, look it up in the dictionary. A dictionary is the most useful book.
1.What’s the meaning of the underlined word?
A.标语 |
B.信号 |
C.唱片 |
D.图像 |
2.A dog can tell something__________.
A.by giving signals |
B.by making different sounds |
C.by purring |
D.by barking |
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A.give the others information |
B.express their actions and feelings with words |
C.tell others how they feel |
D.make different sounds, each with its own meaning. |
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A.all the words that we know |
B.more and more words we use |
C.all the words we need |
D.the dictionary which contains thousands of words |
5.What must we do in order to make our vocabulary larger?
A.Make more and more new words |
B.look up some new words in a dictionary |
C.learn more language |
D.Try to read as many books as possible |
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