Question

Every living thing has genes. Genes carry information. 1. They make sure that humans give birth to humans and cows give birth to cows. They also make sure that a dog doesn’t give birth to a frog, or an elephant to a horse. However, genetic engineers take genes from one species-for example, a snake, and transfer them to another-for example, corn. 2. Such new life forms have been described, by some scientists as a real-life Frankenstein(科幻怪人).

Genetic engineers put duck genes into chicken to make the chickens bigger. They put hormones(激素) into cows to make them produce more milk. They put genes from flowers into beans and from fish into tomatoes. 3. It just makes them easier and faster for the farmer to grow.

The effects of genetic engineering on the natural world may be disastrous. The engineers may create strange life beings, or monsters. that we cannot control. 4. They’ll have to find one, fight for one-or kill for one. It may be your land they fight for-or you that they kill. Moreover, the effects of these experiments can often be cruel. In America, pigs were given human genes to make them bigger and less fatty. The experiment failed. The pigs became very ill and began to lose their eyesight. We would all like a better, healthier and longer life, and genetic engineering might give us this. On the other hand, it may be a dangerous experiment with nature. In the story of Frankenstein, the doctor created such a terrible and dangerous monster that he had to destroy it. 5.

A. The information tells us what to do or what not to do

B. We must make sure that this tale remains a story-and no more than that

C. This doesn’t make them cheaper, tastier, or healthier

D. The new life forms have no natural habitat or home

E. Then they feed the tomatoes to the fish

F. In this way a new life form is created

G. They are passed on from generation to generation

Answer

1.G

2.F

3.C

4.D

5.B

【解析】试题分析：文章讲述了基因的传递与基因工程学家的研究。

1.

2.37 Such new life forms have been described，可知如果基因被认为从一个物种传递到另一个物种身上，会产生一个新的物种，即选F。

3.38 It just makes them easier and faster for the farmer to grow．和填空处后面，可知基因工程学家将基因传递到不同物种身上并不能让它们更美味健康，只是更便于耕种，故选C。

4. 39可知这种新的基因嫁接对自然界可能是一种灾难，这些新的生命形式或物种，在自然界中找不到栖息地，故选D。

5.40在科学怪人的故事里，医生创造了无法击败的怪物，所以我们必须确保那只是个不会发生的故事。故选B。

【名师点睛】

七选五的解题技巧

1、先看选项。跟完形填空不一样，七选五的答案选项较少，并且给出的都是句子，因此，我们可以通过句子的完整性或者句子后面的标点符号来判断该句在文章中的位置。另外，通过阅读选项，有可能找出跟其他选项表达完全不同意思的句子，这样的话我们就可以直接将该选项排除。

2、再看空前空后。由于七选五空出的是整个句子，而这些句子与句子之间，必然有一种联系，因此我们可以通过选项中某个名词或动词跟空前或空后的一致性或者相关性来确定这两个句子之间有一种关联性，从而选择正确的答案。

3、注意代词或定冠词。在做这类题目的时候，一定要注意句子中出现的人称代词或者指示代词，因为我们知道，代词是指代一个名词或者一个句子的，然后通过代词在句子中所做的成分我们可以推断出它指代的句子的类型，我们要做的就是从选项中找这类句型就可以了。

4、注意一些特殊疑问词。如果选项中或空前出现特殊疑问词，一定要把这句话仔细读几遍，因为对于不同特殊疑问词的回答方式是不一样的，比如对why的回答，后面要有because等表原因的词，对when的回答，后面要有表时间的状语，对where的回答，后面要有表地点的名词，对how的回答，后面要有方式状语等。

5、注意一些连词。如一些表示转折的连词，but，However，yet，though，nevertheless等，另外还有一些表示并列关系的连词如and，also，aswellas，neithernor，eitheror，notonly...butalso，ononehand....ontheotherhand等。因为这些连词可以表现句子与句子之间的关系，通过不同的连词我们可以推知句子与句子之间不同的关系。

考点：考查信息匹配