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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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
The newspaper reported on the initiative of the organization to establish a private company to professionally ______ prisoners due to be released from prison.
A．habilitate
B．rehabilitate
C．preclude
D．prelude
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