2. 外语
  3. A．overuse face masks B．deal with the mask problem seriously C．rub their faces and noses in the subway D．protest against the mask

A．overuse face masks B．deal with the mask problem seriously C．rub their faces and noses in the subway D．protest against the mask

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问题 A．overuse face masks
B．deal with the mask problem seriously
C．rub their faces and noses in the subway
D．protest against the mask guidelines
E. help protect people from being attacked by a flu
F. announce the results of their mask research
The public will not know the answer about masks until scientists ______.
选项
答案F
解析 问题句中语意的提示提供了直接答案。最后一段提到普通民众须等待科学家公布他们对口罩研究的结果，所以F是正确答案。
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