Q:

The information of the global climate conditions in the past can be obtained(获得)through _________.

A.separating carbon dioxide from the air

B.examining the growth ringsof trees

C.comparing temperatures in different areas

D.studying the ice and air caught in each layer

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正确答案:D

这是一道细节推断题。根据第三段“And the ice and air caught in each layer have begun to answer questions about the climates in the past.”可判断出对沉积在各层的雪和对空气的研究可知道过去气候的状况。

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