单项选择题

These courses, if properly conducted, will ______ the minds of the students.

A．refresh
B．renew
C．stimulate
D．encourage
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单项选择题
Every dog that came ______ was a terror to me.
A．in sight
B．to sight
C．on sight
D．at sight
单项选择题
The new medicine the doctor ______ for the pain in my stomach is imported and quite expensive.
A．bought
B．prescribed
C．described
D．discovered
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