单项选择题

IPM is a plan that______.

A．uses the pests' natural enemies
B．controls the pests' breeding environment
C．develops stronger strains of seeds
D．does all of the above
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单项选择题
UNEP has found______.
A．182 resistant pests
B．223 resistant pests
C．228 resistant pests
D．364 resistant pests
单项选择题
In the U. S. today______.
A．there are altogether three departments which protect customers and workers
B．stores dealing in foods and drugs are under government control
C．a company with poor or dangerous working conditions is likely to be punished
D．the protection of workers' health and safety is well ensured
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