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
These examples show that openness and the ability to change brings couples a giant step closer to the marital harmony they ______.
A．request
B．negotiate
C．crave
D．detest
单项选择题
Cox Radio, one of the nation's largest radio chains, plans to ______ its ties with independent record promoters to distance itself from a payola-like practice that runs rampant in the music business.
A．consolidate
B．tout
C．sever
D．splash
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