单项选择题

During their first teacher-training year, the students often visited local schools for the ___________ of lessons.

A．investigation
B．inspection
C．repetition
D．observation
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单项选择题
The guest ___________ one of the hotel servants of stealing her money when she was out.
A．blamed
B．accused
C．charged
D．criticized
单项选择题
If the idea comes true, people ___________.
A．will enjoy the most efficient and economical air-conditioning device
B．can store up a large amount of winter cold and use it anytime
C．can make full use of winter cold to preserve food in summer
D．may use a bit of winter's chill to help them survive a hot summer
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