单选题：The writer introduces each category in the passage by

题目分类：理工类
题目类型：单选题
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题目内容：

The writer introduces each category in the passage by A．defining it
B．giving an example
C．explaining why it is hard to write
D．telling when people first began writing it

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答案解析：

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分类：理工类题型：单选题

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请在第(58)处填上正确答案。

请在第__(58)__处填上正确答案。A．knocked B．beaten C．slapped D．affected

分类：理工类题型：单选题

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What does the writer want to tell us____?

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分类：理工类题型：单选题

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The heat released by burning oil and coal is the direct caus

The heat released by burning oil and coal is the direct cause of global warming.

分类：理工类题型：单选题

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