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
Ms. Rice, with customary class, simply expressed hope that this episode wouldn't ______ the charity in spite of the previous scandals.
A．taint
B．enhance
C．sprain
D．sponsor
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