单项选择题

A body, ______ it is in motion, would never stop itself if there were no friction.

A．where
B．by time
C．once
D．at the moment
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单项选择题
There is a way ______ he can be saved.
A．whereas
B．whereby
C．while
D．thereafter
单项选择题
All the parts of these washing machines are ______ , so that it is very convenient to replace them.
A．normalized
B．modernized
C．mechanized
D．standardized
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