A. Reasons for Excluding Masks from the Self-protection List B. Effort to Stop Flu Spreading C. When to Use Face Masks

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问题 A. Reasons for Excluding Masks from the Self-protection List   
B. Effort to Stop Flu Spreading   
C. When to Use Face Masks   
D. Guidelines on Mask Use     
E. Warnings from the CDC    F. Danger of Infection through Germy Hands and Masks


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答案A

解析
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