Currently, scientists are creating new species with desired characteristics in the lab significantly faster than natural evolution creates new species. In a single generation, new species can be created and destroyed by mankind, while natural evolution could take thousands of years to do the same but only accidentally. Scientists are even able to replace defective (有缺陷的) or damaged genes with different genes to attempt to cure genetic defects. This is something that natural evolution could possibly never correct.

　　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?

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