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
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
单项选择题
The manufacturers hoped that the motor show would ______ their car sales.
A．promise
B．lift
C．intensify
D．boost
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