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

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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

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