第二节 (共5小题；每小题2分，满分10分)

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。Every living thing has genes. Genes carry information. 36.________

　　They make sure that humans give birth to humans and cows give birth to cows. However, genetic engineers take genes from one species— for example, a snake, and transfer them to another — for example, corn. 37.________ 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.________

　　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. 39.________ 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. 40.________

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