单选题：Which of the following statements is true?

题目分类：理工类
题目类型：单选题
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题目内容：

Which of the following statements is true? A．Scientists warn the next flu is coming soon.
B．Asian bird flu is spreading easily from person to person.
C．Masks protect people because they keep viruses away.
D．Masks are not effective if a flu strikes.

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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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