23. Paragraph 2 __________
24. Paragraph 3 __________
25. Paragraph 5 __________
26. Paragraph 6 __________
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 |
27. The scientists are trying to find out if masks may or may not __________．
28. The CDC is afraid that the public may? __________．
29. The public will not know the answer about masks until scientists __________．
30. We can infer from the passage that the US authorities __________．
|
A．overuse face masks |