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
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
单项选择题
Ms. Rice, with customary class, simply expressed hope that this episode wouldn't ______ the charity in spite of the previous scandals.
A. taint

B. enhance

C. sprain

D. sponsor
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