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
He studied hard at school when he was young, ______ contributes to his success in later life.
A．which
B．that
C．what
D．each of which
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单项选择题
Robert looked as if he were about to ______ when his motives were questioned.
A．flare up
B．jump up
C．burst up
D．look up
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