Eventually scientists will even be able to improve the quality of people. For example, imagine not only correcting your eyesight with gene treatment, but also ensuring that all of your children do not receive your old genes of poor eyesight too. Scientists will one day be able to improve the memory and intelligence of your children, so that they will do better in school and achieve more in life. Doctors and scientists will be able to customize (订制) babies before they are born just like picking options at a car store.

　　1.According to the first paragraph,______ .

　　　A. man-made evolution has improved all species

　　　B. man-made evolution has weakened some species

　　　C man-made evolution can make up for all natural losses

　　D. natural evolution won’t happen without man’s assistance

　　2. What does the underlined part “taken a back seat to” in Paragraph 2 mean?

　　　A. Become powerful assistance to.

　　B. Become a huge barrier to.

　　　C Speeded up the process of.

　　D. Played a less important role than.

　　3 What does the third paragraph mainly talk about?

　　　A. Why natural evolution happens so slowly.

　　　B. The way scientists adopt to have genetic defects repaired.

　　　C. The advantages of man-made evolution over natural evolution.

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