第十九组(建议用时:30分钟)Ⅰ.阅读理解(2015·江西八校联考)Around the worldabout onethird of nests collapse each year.For bees and the plants they pollinate (授粉)ng because there is not one cause,but rather a thousand little cuts.The main elements include the mixed impact of pesticides (杀虫剂) applied to fieldsnutritional shortages caused by vast acreages of singlecrop fields that lack diverse flowering plants; and commercial beekeeping itself,which destroys groups by moving most bees around the country multiple times each year to pollinate crops.
The real issue,though,is not the volume of problems,but the interactions among them.Here we find a major lesson from the bees that we ignore our risk:the concept of synergy(协同作用), from more than 120 pesticides.Alone,each represents a benign dose (良性剂量). But together they form a poisonous soup of chemicals whose interplay (相互作用) can
greatly
reduce
the effectiveness of bees’ immune systems.
Observing the death of honeybees should warn us that our own wellbeing
might
be
similarly
threatened,and
the widespread collapse of so many groups presents a clear message.We must demand that our regulatory authorities require studies on how exposure to low dosages of combined chemicals
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