单项选择题

It is also important that the public should recognize the current debate for what it is: scientists behaving ______, as they should.

A．cowardly
B．crucially
C．critically
D．crossly
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单项选择题
Costs for regulation of business actually are a hidden tax severely reducing the competitiveness of domestic businesses ______ when they face an increasingly global marketplace.
A．at times
B．at present
C．at once
D．at a time
单项选择题
Perhaps the only ______ that physicists have are, for big science, the cultural appeal to the public of fundamental laws of nature and of the Universe.
A．alley
B．allies
C．alloy
D．allergy
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