7.Every living thing has genes.Genes carry information.(36)G 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. (37)F Such new life forms have been described,by some scientists as a real-life Frankenstein.
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.(38)C 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 contro1. (39)D They'11have 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.(40)B

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.

分析 每種生物都有基因.基因攜帶信息,使得物種穩(wěn)定地代代相傳,然而基因工程師可以通過剪切基因來形成新的物種.這一方面可以使我們生活過的更好更健康,但是也會帶來未知的危險和災(zāi)難.

解答 36.G.上文說基因承載著信息,下文說他們使人能夠生出人,牛生牛,也就是說基因是代代相傳的,即They are passed on from generation to generation,故選G.
37.F.根據(jù)上文genetic engineers take genes from one species-for example,a snake,and transfer them to another-for example,基因工程師從一種物種上提出基因,轉(zhuǎn)移到另一物種上.這樣新的物種就形成了,故選F.
38.C.由下文的 It just makes them easier and faster for the farmer to grow,對農(nóng)民來說,他們只是更容易生長,可知,C項"這沒有使他們更便宜,更好吃或者更健康"符合語境.故選C.
39.D.由下文的They'11have to find one,fight for one-or kill for one,他們將不得不為找一個棲息地而斗爭或者廝殺,也就是說他們沒有天然的棲息地,故選D.
40.B.由上句In the story of Frankenstein,the doctor created such a terrible and dangerous monster that he had to destroy it,故事中醫(yī)生創(chuàng)造了可怕的物種,所以不得不消滅它,因此,We must make sure that this tale remains a story-and no more than tha,我們只能確保這只是一個故事,不讓其真的發(fā)生,故選B.

點評 本篇七選五較為簡單,句子都是通過上一句或下一句句意就可以選出,不需要太多對全文的把握.主要考察考生對句子的理解力和簡單的邏輯推理能力.

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