单项选择题

In a time of social reform, people's state of mind tends to keep______with the rapid changes of society.

A．step
B．progress
C．pace
D．touch
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单项选择题
However, at times this balance in nature is______, resulting in a number of possibly unforeseen effects.
A．troubled
B．disturbed
C．confused
D．puzzled
单项选择题
A person's calorie requirements vary______his life.
A．across
B．throughout
C．over
D．within
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