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

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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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