单项选择题

The authors of the United States Constitution attempted to establish an effective national government while preserving ______ for the states and liberty for individuals.

A．autonomy
B．dignity
C．monopoly
D．stability
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单项选择题
As an industry, biotechnology stands to ______ electronics in dollar volume and perhaps surpass it in social impact by 2020.
A．contend
B．contest
C．rival
D．strive
单项选择题
Equipment not ______ official safety standards has all been removed from the workshop.
A．conforming to
B．consistent with
C．predominant over
D．providing for
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