__3__ is required is that you need perfect DNA and enough __4__ (diverse) in the group to overcome illnesses, which means having animals with their genes __5__ (arrange) in different ways. The advantage is __6__ if there is a new illness some of these animals may die, but others will survive. A __7__ (suit) habitat would be needed for the extinct animals to lead a natural life, so it would be __8__ (fair) to clone any of them if they were to live in a zoo.
__9__ (base) on the reasons above, we are a long way from being able to clone extinct animals, so the chance of dinosaurs ever returning to the earth is __10__ (mere) a dream.
答案
1.unfortunately 2.or 3.What 4.diversity 5.arranged
6.that 7.suitable 8.unfair 9.Based 10.merely
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