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
IPM is different from the older methods because______.
A．chemical poisons are only used when necessary
B．chemical poisons are used very often
C．pests are completely destroyed
D．farmers do not have to worry about pests
单项选择题
UNEP has found______.
A．182 resistant pests
B．223 resistant pests
C．228 resistant pests
D．364 resistant pests
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