单项选择题

In his ______ to further his knowledge of the universe, man has now begun to explore space.

A．attempt
B．expedition
C．trial
D．chase
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单项选择题
Composed of song, dance, and personal invective, the old comedy plays also include outspoken political criticism and comment on literary and philosophical topics.
A．comical
B．witty
C．satirical
D．frank
单项选择题
Penal systems of most countries provide for more protracted imprisonment of habitual offenders than would normally be imposed upon first offenders.
A．restricted
B．specified
C．testified
D．prolonged
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