单项选择题

You see the lightning ______ it happens, but you hear the thunder later.

A．the instant
B．for an instant
C．on the instant
D．in an instant
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单项选择题
The new washing machines are ______ at the rate of fifty a day.
A．turned up
B．turned down
C．turned out
D．turned in
单项选择题
Reading is to the mind ______ food is to the body.
A．what
B．as
C．that
D．like
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