单选题：There isn't enough land to support human being because

题目分类：理工类
题目类型：单选题
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题目内容：

There isn't enough land to support human being because A．most of the world's land is unusable.
B．there are more seas than land in the world.
C．the world's land has already been taken up.
D．the world's land is not distributed equally.

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