单项选择题

Tile word "challenged" in Para. 3 most probably means ______.

A．"fought against"
B．"criticized"
C．"doubted or suspected"
D．"disapproved"
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单项选择题
From the passage we can learn that ______.
A．Jack's trouble is serious
B．the family doctor has been called in
C．people depend too much on antibiotics for small infection
D．most people prefer antibiotics to any other medicine
单项选择题
The cause(s) of the excessive use of antibiotics is (are) ______ according to the passage.
A．that some doctors prescribe them too freely
B．that patients ask for them even for minor conditions
C．the ignorance of the body defence systems
D．all of the above
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