单项选择题

A major role of computer science has been to alleviate problems, mainly by making computer systems cheaper, faster, more reliable, and easier to use.

A．exclude
B．lessen
C．clarify
D．evade
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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
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
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