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Review: Ice Cores I
Explanation
We have already answered this question: the author's
purpose here is to describe the ice core method. The most fitting answer choice
is (D). Choices (A), (B), and (C) are out because the passage reveals nothing
about the data or results obtained from ice core research. (E) would entail passing judgment on the ice core method, which
the author does not do; the tone is only subtly positive.
The correct answer is (D).
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