单选题：A virus，often too small to be seen except with a powerful mi

题目分类：英语运用能力测试
题目类型：单选题
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题目内容：

A virus，often too small to be seen except with a powerful microscope，__________ diseases．（　　） A．Cause
B．is caused
C．causes
D．is causing

参考答案：

答案解析：

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The word critical in the passage is closest in meaning to

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分类：英语运用能力测试题型：单选题

The Victorian speaker was noted for his manual gestures.

The Victorian speaker was noted for his manual gestures.A．A　expressive B．B　physi

分类：英语运用能力测试题型：单选题

The word which in the passage refers to

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