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（遺傳的） material. Foods from plants grown in this way are called genetically modified(改變的) 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.
小題1:GM foods are made by                 
A. farmers            B. workers      C. scientists          D plants
小題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.
小題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
小題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.
小題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

小題1:C
小題1:D
小題1:A
小題1:C
小題1:B

1. C 根據(jù)Since 1983, scientists have been able to change plants more quickly by changing their genetic（遺傳的） material可知是由科學家制造出來的，選C。
2. D 此題講的是這些遺傳基因改變的食物的優(yōu)點，定位到第三段。從They make plants which are strong against plant diseases. They can also help in our diseases可知A和C都是其中的一個方面，故選D。
3. A 細節(jié)題的考查。從because they help produce more food可知它們能夠幫助產(chǎn)生更多的食物，故是一種快速生產(chǎn)食物的途徑，故選A。
4. C 本題問的是人們不喜歡的原因，從There are strong feelings against them, because they are unnatural人們強烈反對是因為它們不是自然的，故選C。
5. B 此題是推測類型的題。根據(jù)文章倒數(shù)第二句But both rich and poor countries are interested in their use, and they are not going to可知它們不會消失（go away），相當于disapper,故選B。
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