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
A person's calorie requirements vary ______ his life.
A．across
B．throughout
C．over
D．within
单项选择题
He offered to ______ her a hand as the suitcase was too heavy for her to carry.
A．help
B．show
C．lend
D．borrow
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