单选题：What'stheauthor'spurposeofwritingthispassage?

题目分类：英语六级
题目类型：单选题
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题目内容：

What'stheauthor'spurposeofwritingthispassage? A．Toemphasizethatgravityisessentialforus.
B．Toexplainwhatgravityis.
C．Toadvocateenvironmentalprotection.
D．Toillustratehowgravityworks.

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