C.mixed pesticides mean they are much more poisonous
D.mixed pesticides mean they are much more effective
3.The lesson people can learn from bees' death is that ________.
A.medicine is as powerful as pesticides
B.our health might be threatened by pesticides
C.we should protect bees by reducing the usage of pesticides
D.medicine may be harmful to us when used together
4.What is the last paragraph mainly about?
A.Keeping a balance with nature is important.
B.More plants mean more and healthier bees.
C.Bees are very important to agriculture.
D.Bees can bring in good higher profits to farmers.
答案:
解题导语:本文主要讲述了蜜蜂大量消失的原因以及给人们带来的启示。
1.A 解析:细节理解题。根据第二段中的“nutritional shortages caused by vast acreages of singlecrop fields that lack diverse flowering plants”可知,营养的缺乏是因为缺少正在开花时节的植物。故选A项。
2.C 解析:推理判断题。根据第三段的最后一句“But together they form a poisonous soup of chemicals”可知,混合型的杀虫剂毒性更大,即C项正确。
3.D 解析:推理判断题。根据倒数第二段中的“how exposure to low dosages of combined chemicals may affect human health before approving compounds”可推知,药物混合使用可能会对人体有害,即D项正确。
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