Of the 500 million different species from living creatures that have appeared on earth, nearly 99 percent have vanished.

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问题 Of the 500 million different species from living creatures that have appeared on earth, nearly 99 percent have vanished.

选项 A、of
B、in
C、for
D、on

答案A

解析 species与living creatures是所属关系,故of为正确答案。
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