Gene technology can help to give birth to healthy and clever children. Some families, with the English imperial family being a good example, have hereditary(遗传的)diseases. This means their children will for sure have the family disease, which is a great trouble for these families. In the past, doctors could do nothing about hereditary diseases. But gene technology can solve this problem perfectly. The scientist just need to find the wrong gene and correct it , and a healthy child will be born.

　　Some people are worrying that the gene research can be used to manufacture human beings in large quantities. In the past few years, scientists have succeeded in cloning a sheep. Therefore these people predict that human babies would soon be cloned. But I believe cloned babies will not come out in large quantities, for most couples in the world can have babies in very normal way. Of course, the government must take care to control gene technology.

　　What does “these two killers” in the second paragraph refer to?

　　Gene technology and another treatment of the two diseases.

　　The two murderers who killed the cloned baby.

　　The two diseases of cancer and heart disease.

　　Hereditary diseases and cancer

　　What's the main idea of the third paragraph?

　　How gene technology can be applied in the field of treating hereditary diseases.

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