单项选择题

Sound travels __ air.

A．through water faster and
B．where it is faster through water than through
C．faster through water than through
D．faster than through water and
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单项选择题
There is one suggestion that the footsteps of crowds walking the streets in major cities could __energy.
A．assemble
B． gather
C． generate
D．yield
单项选择题
The medical record shows that it was the drag, not the disease, __ him several years ago.
A．that
B．finally
C．the effects of which
D． the effect of which
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