单项选择题

You should probably ______ the point whether it is worthy of your efforts before you make the final decision.

A．impart
B．cater
C．assert
D．ascertain
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单项选择题
The doctor warned him that his __________ chest pain might turn chronic if not treated in time.
A．perpetual
B．persistent
C．eternal
D．periodic
单项选择题
The Counter-culturists in the 1960s were described as a gang of young people who __________ alcohol and drugs.
A．hang on
B．engage in
C．indulge in
D．subscribe to
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