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

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

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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 与题干有关的内容在第七段能够找到。根据该段所表达的意思，F是正确答案。
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