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
But many in the commission are well aware of such needs, and are seeking to address them.
A．thriving
B．striking
C．scrambling
D．striving
单项选择题
People in the United States in the nineteenth century were haunted by the prospect that unprecedented change in the nation' s economy would bring about social chaos.
A．occupied
B．overwhelmed
C．obliged
D．obsessed
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