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.

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

　　BDC

　　阅读理解。阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。

　　In business, there is a speed difference: It's the difference between how important a firms leaders say speed is to their competitive (竞争的) strategy（策略）and how fast the company actually moves. The difference is important regardless of industry and company size .Companies fearful of losing their competitive advantage spend much time and money looking for ways to pick up the speed.

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