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
We can infer from the passage that the US authorities______.
选项
答案B
解析 authorities是“政府部门”。美国有关部门出台了一份包括口罩使用在内的指导原则，又有科学家对口罩的使用问题进行专项研究，应该说工作是严肃认真的。题干接上选项B的“deal with the mask problem seriously”就表达了这层意思。B是正确答案。
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