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
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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
单项选择题
Telecommuting, ______ the computer for the trip to the job, has been hailed as a solution to all kinds of problems related to office work.
A．substitutes
B．substitution of
C．substituting
D．to substitute for
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