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
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单项选择题
According to the passage, an unlabeled use of a drug is any use that ______.
A．has been reviewed by the FDA and specifically rejected
B．is medically beneficial despite the fact that such use is prohibited by law
C．is made in experiments designed to determine whether a drug is medically beneficial
D．has medical value but has not yet been approved by FDA for inclusion as a labeled use
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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