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【单选题】
Based on the information from the FAQs, which of the following can you infer?
A.
Governments give free flu vaccines.
B.
People don’t know what the flu is.
C.
The flu is the most difficult global health problem today.
D.
Understanding the flu is important for people around the world.
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参考解析：
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举一反三
【单选题】Your symptoms have developed gradually. Which illness do you probably have?
A.
A cold
B.
The flu
C.
Either the cold or the flu
【单选题】Which disease can usually be prevented by a vaccine?
A.
A cold
B.
The flu
C.
Both a cold and the flu
【单选题】Which disease is most likely to be dangerous?
A.
A cold
B.
The flu
C.
Both a cold and the flu