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
We can infer from the passage that the US authorities ______.
选项
答案B
解析 句子中有直接的语意提示，同时用问题句中的核心词“us authorities”作为答案线索，推断出美国权威机构对待口罩问题采取的是一种非常严肃的态度。
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