单项选择题

Most sound vibrations arrive at the eardrum by way of the auditory canal.

A．search for
B．reach
C．tickle
D．whisper to
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单项选择题
The osprey flies above the water and when it spots a fish it swoops down to catch it.
A．drops
B．sees
C．wants
D．selects
单项选择题
Until the late nineteenth century,there was no uniform system of time-keeping in the United States.
A．personal
B．efficient
C．consistent
D．practical
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