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题目内容
（河南科技大学大学英语3(专升本)）
Usually it cannot (get out) because the outside of the earth is too thick and strong. But in some places the outside of the earth is ____ and weak.
选项:
A:thin
B:thick
C:flat
D:water
选项:
A:thin
B:thick
C:flat
D:water
参考答案
