问题描述：
the earth's surface与 the surface of the earth的区别
在 Secientist say that much of____is covered with water?中为什么选the surface of the earth ,不能选the earth 's surface
在 Secientist say that much of____is covered with water?中为什么选the surface of the earth ,不能选the earth 's surface
问题解答：
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