Usually it cannot because the outside of the earth is too thick and strong. But in some places the ——青夏教育精英家教网—

摘要： Usually it cannot because the outside of the earth is too thick and strong. But in some places the outside of the earth is and weak. 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.
A. thin B. thick C. flat D. water

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