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What is 'proxy measurement' in Paragraph 1 likely to refer to?
A.Studying the characteristics of glaciers.
B.Measuring the growth signs of aquatic organism.
C.Taking advantage of previous pictures.
D.Using clues left from the past.

A.Studying
B.
B.Measuring
C.
C.Taking
D.
D.Using

【参考答案】

D
解析：本题考查通过上下文猜词意的能力，问“第一段中的'proxy measurement' 指的是什么”。通......

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A.To
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C.To
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