单项选择题

Industrial leaders are Worried lest new inventions make their plants unprofitable to operate; they therefore wish to protect themselves against possible ______.

A．depreciation
B．obsolescence
C．casualties
D．bankruptcies
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单项选择题
We have in America a ______ speech that is neither American, Oxford English, nor English but a combination of the three.
A．hybrid
B．nasal
C．mangled
D．feigned
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
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