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
You are exposed to obtrusive ads that ______ seemingly from nowhere even when you are disconnected from the Net, and your personal information gathered and sent off without you being aware of it.
A．size up
B．dwindle away
C．conjure up
D．pop up
单项选择题
Early signs of ______ seen in the herbal medicine study are extremely encouraging and based upon these data, we are now planning a registration program.
A．faculty
B．reception
C．deterioration
D．efficacy
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