单项选择题

Strike ______ the iron is hot.

A．if
B．when
C．as
D．while
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单项选择题
How to determine the ______ of the hill with the aid of a barometer (气压计)
A．altitude
B．attitude
C．gratitude
D．attribute
单项选择题
The used old small typewriter is really ______.
A．a piece of cake
B．a piece of work
C．a piece of junk
D．a valuable machine
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