单项选择题

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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单项选择题
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
单项选择题
If all the viruses on the planet were to disappear, a global catastrophe would ______ , and the natural ecosystems of the earth would collapse in a spectacular crash under burgeoning populations of insects.
A．varnish
B．disperse
C．contaminate
D．ensue
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