单项选择题

The discrepancies between these different analyses ______ a number of problems.

A．summon
B．pose
C．confront
D．marshal
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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
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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