Which of the following does the passage mainly discuss? According to the passage, the drilling of the glacier in eastern Antar

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问题 Which of the following does the passage mainly discuss?
According to the passage, the drilling of the glacier in eastern Antarctica was important because it

选项 A、allowed scientists to experiment with new drilling techniques
B、permitted the study of surface temperatures in an ice-covered region of Earth
C、provided insight about climate conditions in earlier periods
D、confirmed earlier findings about how glaciers are formed

答案C

解析

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托福（TOEFL）

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Which of the following does the passage mainly discuss? According to the passage, the drilling of the glacier in eastern Antar

托福（TOEFL）

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