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
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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
单项选择题
A strike is usually resorted to only when less __________ measures fail.
A．watertight
B．drastic
C．prevalent
D．adverse
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