单项选择题

Paper produced every year is four times ______ the weight of the world's production of vehicles.

A．/
B．that of
C．which
D．of
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单项选择题
I tried to relax because I knew I would use up my oxygen sooner, ______.
A．the more excited I got
B．I got excited more
C．and more I got excited
D．and I got more excited
单项选择题
In the ______ of human life the honors and rewards fall to those who show their good qualities in action.
A．ring
B．terrace
C．arena
D．ground
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