2017高考四川省广安市英语阅读理解一轮系列训练：20（含解析）_高考复习指南

　　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.

　　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.

　　　D. How scientists make use of man-made evolution to create new species.

　　参考答案1--3BDC

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