单项选择题

The senator agrees that his support of the action would ______ his chances for reelection.

A．obscure
B．mystify
C．distinguish
D．jeopardize
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单项选择题
Among the more common scenes are those in the courtyards of apartment buildings where the children play, while their elders gossip on benches, and young people congregate to listen to music.
A．assemble
B．captivate
C．engage
D．fascinate
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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