单项选择题

I don' t really know John all that well; he' s just a ______ acquaintance.

A．random
B．formal
C．casual
D．haphazard
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单项选择题
She found the evening boring and uninteresting, ______ , a waste of time.
A．in short
B．in consequence
C．in general
D．in force
单项选择题
The microscope can ______ the object 100 times in diameter.
A．magnify
B．increase
C．develop
D．multiply
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