Which of the following does the passage mainly discuss? It can be inferred from the last paragraph that a glacier

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问题 Which of the following does the passage mainly discuss?
It can be inferred from the last paragraph that a glacier

选项 A、can revert to a fluffy mass
B、maintains the same shape through out the glacial process
C、is too cold to be thoroughly studied
D、can contribute water to lakes, rivers, or oceans