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
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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
单项选择题
______ when he discovered the costs, nevertheless, eventually, he went.
A．To surprise
B．Surprisingly
C．Slightly exciting
D．Somewhat taken aback
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