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

Generous public funding of basic science would （） considerable benefits for the country's health, wealth and security.

A．lead to
B．result from
C．lie in
D．settle down

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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