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
The author regards the practice of using drugs for medically valid purposes before FDA approval as ______.
A．an illegal activity
B．a dangerous policy
C．a necessary compromise
D．a short-term phenomenon
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
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