单项选择题

Weather exports use the ______ of the barometer as one of their guides in predicting the weather.

A．isobars
B．fluctuations
C．gradations
D．mercury
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单项选择题
It has been said that printing does as much harm as good, since it gives us bad books as well as good ones and ______ falsehood and error no less than knowledge and truth.
A．displays
B．betrays
C．demonstrates
D．propagates
单项选择题
In this land of plenty, we must be ashamed of the ______ and suffering that still exists in the slum areas.
A．poverty
B．misery
C．filth
D．anguish
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