Many species of animals which once lived on the earth are no longer in ______.A、

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问题 Many species of animals which once lived on the earth are no longer in ______.

选项 A、existence
B、survival
C、life
D、reality

答案 A

解析 existence n．存在(be in existence存在；come into existence开始存在：go out of existence不复存在)。survival n．幸存，继续生存；幸存者，残存物。in reality实际上。

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