31. What is the passage mainly about?
A. Widespread use of face masks.
B. Possibility of a worldwide flu outbreak
C. New discoveries of a face mask research.
D. Effectiveness of wearing face masks
32. The CDC suggests that people
A. stay alone when being sick.
B. wear face masks when going to a crowded place.
C. wear face masks wherever possible.
D. remain at home if living with someone whos sick.
33. The word that in Paragraph 3 refers to
A. making preparations.
B. avoiding exposure
C. coming up with guidelines.
D. wearing face masks everywhere.
34. Which of the following statements is true?
A. Scientists warn the next flu is coming soon.
B. Asian bird flu is spreading easily from person to person.
C. Masks protect people because they keep viruses away.
D. Masks are not effective if a flu strikes.
35. One of the concerns the CDC has is that
A .masks may give people a wrong assumption of being safe.
B. the sick may not wear masks and go out.
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