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【简答题】
What percentage of healthy people under the age of 65 can flu vaccines help in the U.S. every year?
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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
【单选题】Which disease is spread by coughing and sneezing?
A.
A cold
B.
The flu
C.
Both a cold and the flu
【单选题】You have a high fever. Which illness do you probably have?
A.
A cold
B.
The flu
C.
Both a cold and the flu
【单选题】You had the flu two months ago. Now you are sick again. Which disease do you probably have?
A.
A cold
B.
The flu
C.
Either the cold or the flu
【单选题】There is an epidemic. Which disease is probably causing it?
A.
A cold
B.
The flu
C.
Either a cold or the flu