单项选择题

The author's primary concern is to ______.

A．refute a theory
B．draw a distinction
C．condemn an error
D．describe a new development
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单项选择题
All of the following are mentioned in the passage as reasons for allowing unlabeled uses of drugs except ______.
A．the increased cost to the patient of buying an FDA approved drug
B．the availability of publications to inform physicians of the existence of such uses
C．the time lag between initial discovery of a medical use and FDA approval of that use
D．the possibility that a medically beneficial use may never be clinically documented
单项选择题
It is implied that many professional photographers are of the opinion that ______.
A．photography has lost its distinctive status as an art
B．photography should not be put against traditional art
C．some of them have forgotten that photography is an art
D．some of them have neglected the miseries of the modem society
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