【单选题】Questions 11 to 15 are based on the following passage.
Scratchy throats, stuffy noses and body aches all spell misery, but being able to tell if the cause is a cold or flu (流感) may make a difference ...
A.
According to the passage, to combat the flu effectively, ()
B.
one should consult a doctor as soon as possible
C.
one should take medicine upon catching the disease
D.
one should remain alert when the disease is spreading