Today there are 6billion people on the earth．By the year 2050there may be 12.5billion．This means we need more food．One way to produce more food is by growing stronger plants．For thousands of years 题目和参考答案——青夏教育精英家教网—

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6．Today there are 6billion people on the earth．By the year 2050there may be 12.5billion．This means we need more food．
One way to produce more food is by 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 material （遗传物质）．Foods from plants grown in this way are called genetically modified foods （转基因食品），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 （准备），for example，which stops people from becoming blind．
Rich countries produce GM food 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 very interested in their use，and they are not going to go away．In 2050we may think differently about them．

根据短文内容，从A、B、C、D四个选项中选择正确答案，并将其字母代号填入答题卷相应空格内．
86．GM foods are made byC．
A．farmers    B．workers    C．scientists   D．plants
87．What are the good things about GM foods？D
A．They make plants strong against diseases．
B．They are unnatural．
C．They can help in human diseases．
D．Both A and C．
88．GM foodsA．
A．are a quick way to produce food
B．grow in the wild
C．are safe
D．are grown only in rich countries
89．Why do some people not like GM foods？C
A．They are not useful．B．They are not helpful．
C．They are not natural．D．They are not cheap．
90．From the reading we know that．B
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 food
D．people will have to stop using GM food．

分析这篇短文主要讲述转基因问题．文章指出，转基因可以使植物增强抗病能力，也可以对人类疾病有帮助．同时指出，转基因植物非自然生长，其好坏尚不可知．

解答 86．C．细节理解题．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．
87．D．细节理解题．此题讲的是这些遗传基因改变的食物的优点．根据短文They make plants which are strong against plant diseases．They can also help in our diseases的描述可知，选项 A和C都是其中的一个方面，故选D．
88．A．细节理解题．根据短文because they help produce more food的描述可知，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．
89．C．细节理解题．本题问的是人们不喜欢的原因，根据短文There are strong feelings against them，because they are unnatural的描述可知，人们强烈反对是因为它们不是自然的，故选C．
90．B．细节理解题．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 go away的描述，可知它们不会消失（go away），相当于disapper，故选B．

点评首先要通读全文，掌握大意．然后细读，瞻前顾后，逐步填空．利用捕捉的信息，注意细节和情节的发展变化，在选择答案时，一定要考虑到上下文的意思，还要考虑到句子的结构，习惯用法，固定搭配和词类的功能，尽量使选出的答案及复合语法又符合原文的意思．

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