雅思

填空题阅读部分第16题：Cotton farmers in Central America began to use pesticides
A because of an intensive government advertising campaign．
B in response to the appearance of new varieties of pest．
C as a result of changes in the seasons and the climate．
D to ensure more cotton was harvested from each crop．

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D

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1阅读部分第17题：By the mid-1960s，cotton farmers in Central America found that pesticides
A were wiping out 50% of the pests plaguing the crops．
B were destroyin9 50% of the crops they were meant to protect．
C were causing a 50% increase in the number of new pests reported．
D were costin9 50% of the total amount they spent on their crops．

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2

阅读部分第18题：Disease-spreading pests respond more quickly to pesticides than agricultural pests do．

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3阅读部分第19题：A number of pests are now born with an innate immunity to some pesticides．

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