单选题：根据以上材料和以下选项请回答题：A．Reasons for Excluding Masks from the Self-

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题目内容：

根据以上材料和以下选项请回答题：
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
Paragraph 2 __________

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分类：理工类题型：单选题