单项选择题

You should have your eyes tested every year in case the ______ of your spectacles need changing.

A．lenses
B．glasses
C．sights
D．crystals
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单项选择题
But the Swiss discovered long years ago that constant warfare brought them ______ suffering and poverty.
A．anything but
B．nothing but
C．none other than
D．no more than
单项选择题
The first sentence in this paragraph is ______ it can be interpreted in many ways.
A．intricate
B．ambiguous
C．duplicated
D．confused
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