单选题IndrillingthroughtheiceinAntar

单选题 In drilling through the ice in Antarctica, scientists have found that _________．A.the lowest temperature there is -40℃B.the depth of ice is 3, 000 metersC.the ice has existed for 15, 000 yearsD.snowfalls are kept in certain patterns

D解析这是一道细节推断题。从第三段“They figure out that the area where summer temperatures can fall to -40℃, has at least 9, 000, 000 years of snowfalls, kept as nearly as the growth rings of a tree．”看出科学家们发现，积雪保持着一定的积累模式。

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