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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If you develop a reputation for being able to keep secrets others will ______ towards you with useful news and gossip.
A．feel constrained
B．feel excluded
C．propel
D．gravitate
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There is little reason to believe that the United States will ______ from its stated goal of regime change in Iraq.
A．back down
B．blow off
C．pop up
D．step up
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