题型:语法填空(语篇) 题类:常考题 难易度:困难
Cloning is a way of 1(make) an exact copy of another animal and plant2 has two major uses. One is3 gardeners use it to produce commercial quantities of plants. The 4is that it is valuable for research on new species and for medical research on animals. 5, the process of cloning is difficult to undertake.
Many attempts to clone mammals failed. The first successful clone, Dolly the sheep, made the whole 6(science) world follow its process, though it had 7 problems than the normal sheep. On the other hand, Dolly's appearance 8(raise) a storm of objections and had a great impact 9 the media and public imagination. Different people have different opinions of it. However, scientists still wonder whether cloning will help 10 harm us and where it is leading us.
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