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
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单项选择题
The solution was simple: gas the building with a hallucinogen and put the terrorists to sleep before they could ______ the bombs in the building. And it worked.
A．detonate
B．dismantle
C．demolish
D．desert
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 d insects.
A．varnish
B．disperse
C．contaminate
D．ensue
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