单项选择题
Which of the following symptoms will distinguish the flu from a cold
A．A stuffy nose.
B．A high temperature.
C．A sore throat.
D．A dry cough.
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单项选择题
According to the author, knowing the cause of the misery will help ______.
A．shorten the duration of the illness
B．the patient buy medicine over the counter
C．the patient obtain cheaper prescription drugs
D．prevent people from catching colds and the flu
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