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
C. 000 meters
D.the ice has existed for 15
E. 000 years
F.snowfalls are kept in certain patterns
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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。