单项选择题

People don't realize how serious this recession has actually been.

A. know
B. think
C. doubt
D. remember
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单项选择题
Chinese people tend to use plants to remedy disease.
A. diagnose
B. cure
C. evaporate
D. revise
单项选择题
The most pressing problem that any country faces is how to use its scarce natural resources.
A. puzzling
B. difficult
C. terrifying
D. urgent
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