Researchers have some ideas about what could be affecting bees' health. They could be sick because of poisons widely used to kill insects, or they might not be getting enough good food to stay strong. Also, tiny insects called mites feed on bees. “A virus or bacteria could also be doing the killing,” explains Pettis.
蜜蜂除了提供蜂蜜之外还帮助植物授粉它们是人类的益友。但加利福尼亚的大量蜜蜂出现了不明原因的死亡这引起了人们对重要粮食作物的担忧。答案 B解析 段落大意题。根据第二段的第二、四句可知蜜蜂可以帮助植物授粉;在美国养蜂人养的数百万只蜜蜂飞来飞去为粮食作物做着这种重要的授粉工作。因此选择B。________.ver return to hives
答案 A解析细节理解题。根据第四段中的“However, 及Pettis的话“It isn't like studying a large animal like a cow that doesn't move around much and is easy to find out in the cow field”可知研究蜜蜂很难是因为它们活动得太多。答案 D解析 细节理解题。根据最后一段中的“A virus or bacteria could also be doing the killing”可知某种病毒可能是蜜蜂大量死亡的原因故选D;由最后一段中的“They could be sick because of poisons widely used to kill insects”可知蜜蜂的死亡也可能是由可广泛用来杀死昆虫的毒药引起的故A项说法不正确。ied in the hive.
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