The first paragraph of the text deals mainly with the earth atmosphere’s ______.

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问题 The first paragraph of the text deals mainly with the earth atmosphere’s ______. [br] According to the text, fossil studies of radiolaria are significant because they ______.

选项 A、live in the depths of the ocean
B、are one-celled
C、have survived through the ages
D、demonstrate climatic changes prior to humans

答案 D

解析 信息推断题。第三段讲到放射虫的化石研究这个例子,目的是为了证明本段主题即第一句话:“气候变化过于复杂,不能只归因于人类活动”。它证明在人类出现之前已经有气候的变化了。
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