单选题：One of the concerns the CDC has is that__________.

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题目类型：单选题
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题目内容：

One of the concerns the CDC has is that__________. A．masks may give people a wrong assumption of being safe.
B．the sick may not wear masks and go out.
C．flu virus may spread via public transportation.
D．healthy people may not know how to protect themselves.

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答案解析：

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分类：理工类题型：单选题