单项选择题

Peter's father asked him to spend his time on something _________ researching into instead of playing all the time.

A．worthy
B．valuable
C．worth
D．previous
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单项选择题
President Jimmy gave a brief _________ of the history of the university before the opening of the conference.
A．comment
B．reference
C．account
D．statement
单项选择题
Though steam engines have now passed the _________ of their usefulness, their heritage remains.
A．prime
B．era
C．epoch
D．date
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