单项选择题

The higher the standard of living and the greater the national wealth,
______.

A．the greater amount of paper is used
B．the greater is the amount of paper is used
C．the greater the amount of paper used
D．the amount of paper used is greater
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单项选择题
The United States is trying to ______ the serious problems created by the energy crisis.
A．put up with
B．submit to
C．comply with
D．cope with
单项选择题
Very few scientists ______ completely new answers to the world's problems.
A．come up with
B．come out
C．come round
D．come up to
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