The paragraph before this passage most probably deals with______.
A.
minor diseases other than colds
B.
the recommended treatment of colds
C.
a factor that affects susceptibility to colds
D.
methods of preventing colds among elderly people
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【单选题】Directions: There are two passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should de...
【单选题】Directions: There are two passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should de...