单项选择题

In 1977 the cotton crop in Texas was______.

A．smaller than average
B．much greater than average
C．better than average
D．exactly average
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单项选择题
Agricultural pests are______.
A．rapidly being destroyed by chemical poisons
B．killed by pesticides
C．dangerous to farmers, scientists, and food planners
D．bec0ming used to poisons
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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