单项选择题

Costs for regulation of business actually are a hidden tax severely reducing the competitive ness of domestic businesses ______ when they face an increasingly global marketplace.

A．on occasions
B．at a time
C．under the circumstances
D．at once
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单项选择题
According to some psychologists, in developing a model of cognition, we must recognize that perception of the external world does not always remain independent ______ motivation.
A．of
B．on
C．upon
D．in
单项选择题
Henry David Thoreau used to ramble through the woods before he wrote his most famous book Walden (1854).
A．roam
B．linger
C．wonder
D．browse
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