单项选择题

Anxiety is believed to ______ diabetes by raising levels of the stress hormone cortisol which regulates insulin and blood-sugar levels.

A．impede
B．exacerbate
C．inherit
D．facilitate
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单项选择题
Cox Radio, one of the nation's largest radio chains, plans to ______ its ties with independent record promoters to distance itself from a payola-like practice that runs rampant in the music business.
A．consolidate
B．tout
C．sever
D．splash
单项选择题
These examples show that openness and the ability to change brings couples a giant step closer to the marital harmony they ______ .
A．request
B．negotiate
C．crave
D．detest
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