Which of the following does the passage mainly discuss? According to the passage, which of the following is the LEAST amount o

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问题  Which of the following does the passage mainly discuss?
  According to the passage, which of the following is the LEAST amount of time necessary for glacial ice to form?

选项 A、Several months
B、Several years
C、At least fifty years
D、A century

答案B

解析
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