单项选择题

The speed ______ is 340 meters per second.

A．at which sound travels
B．with which sound travels
C．of which sound travels
D．for which sound travels
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单项选择题
These courses, if properly conducted, will ______ the minds of the students.
A．refresh
B．renew
C．stimulate
D．encourage
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
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