根据下列材料，回答题。阅读部分第14题：The use of pesticides has contributed toA a c-考呗网

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填空题根据下列材料，回答题。

阅读部分第14题：The use of pesticides has contributed to
A a change in the way ecologies are classified by agroecologists．
B an imbalance in many ecologies around the world．
C the prevention of ecological disasters in some parts of the world．
D an increase in the range of ecologies which can be usefully farmed．

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1阅读部分第15题：The Food and Agriculture Organisation has counted more than 300 agricultural pests which
A are no longer responding to most pesticides in use．
B can be easily controlled through the use of pesticides．
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D may be used as part Of bi0—control’s replacement of pesticides．

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2阅读部分第16题：Cotton farmers in Central America began to use pesticides
A because of an intensive government advertising campaign．
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C as a result of changes in the seasons and the climate．
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3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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