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 scientists are trying to find out if masks may or may not ______.
选项
答案E
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