单项选择题

The cost of healthcare and health insurance remains the most urgent health problem facing the country today.

A．pressing
B．important
C．neglected
D．complicated
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单项选择题
The coach explained the regulations at length to make sure that none of his players would become violators.
A．at last
B．at large
C．in detail
D．in short
单项选择题
Readers are required to abide by the rules of the library and mind their manners.
A．observe
B．memorize
C．review
D．compose
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