As people in Beijing and northern China struggle with severe air pollution this winter,the

As people in Beijing and northern China struggle with severe air pollution this winter,the toxic(有毒的)air is also making life hard for plants and even food crops of China．
in the last 50 years there has been a 1 6-fold increase in ozone(臭氧)pollution”in the Beijing area，said Hanqin Tian of Auburn University in Alabama,who studies the effects of China's pollution and climate change on plants．
Ozone is particularly harmful to plants because it damages the pores(气孔) on leaves，called stomata,which plants use to regulate how much water evaporates from the leaves．That，in turn，affectS how much water a plant must take up through its roots．Changes in water uptake by plants have been documented in other parts of the world，including the United States，as having major impacts on regional groundwater and surface water supplies．
In studies of the long-term productivity of plants，Hanqin Tian and some of his colleagues show that ozone pollution,along with climate change，has been lowering plant productivity in China,which reduces the amount of carbon and other pollutants that the plants Can absorb to fight all the emissions from the burning offossil fuels．
The worst effects on plants are likely to be in areas where the growing pollution problem is just fairly new, said Arthur Chappelka, also a plant researcher at Auburn University．Some plants are more resistant to pollutants than others，he said，and the plants that are living today in long-polluted urban areas are likely to be only those that are very pollution tolerant．
Away from the cities, however, where crops are necded to feed China’s yast population, the effeets of the growing pollution on crops is a significant concern.
“In some ways it affects the crop production and food securiy of China,”said Hanqin Tian.“Air quality is really important for human health, plants and ecosystem and sustainability.”
The problem is bound to get worse as China continues to develop economically, he said, and so he and other researchers continue to urge the Chinese government to take action to reduce emissions from cars and industries.
【小题1】ozone does harm to plants mainly by .A．exposing them to strong sunlightB．damaging the structure of their leavesC．adding more pores to the rootsD．making the land unfit for the plants to grow【小题2】Which of the following statement does Hanqin Tian support?A．Ozone pollution has increased 1 6 times in the past 30 years．B．Ozone pollution has lowered plant productivity alone．C．Plants can take in a large amount of carbon and other pollutants．D．The toxic air has few effects on food supply in China．【小题3】What Can we infer from the passage? A．Healthy foods are not available in Beijing．B．Some kinds of plants aren’t affected by air pollution．C．Crops in China are hard to feed its large population．D．People should stop developing economically【小题4】According to the passage，the Chinese govemment shouldA．care more about developing economyB．reduce the number of cars and industriesC．continue to make more researchesD．take measures to reduce carbon emissions【小题5】What′S the best title of the passage?A．Polluted air damages plants and cropsB．Air pollution is becoming more seriousC．China’s air pollution and climate changesD．Food security in ChinaB

(答案→)B 解析：文章介绍了臭氧和其他有害气体对植物的生长和农作物的产量所具有影响和危害。【小题1】细节题：根据第三段第一句“Ozone is particularly harmful to plants because it damages the pores(气孔) on leaves”臭氧对植物特别有害因为它破坏叶子气孔。故选B。【小题2】推理题： 根据第四段最后一句“ the plants Can absorb to fight all the emissions from the burning offossil fuels”植物可以吸收所有排放燃烧矿物燃料。故选C。【小题3】推理题：根据第四段中“which reduces the amount of carbon and other pollutants that the plants Can absorb to fight all the emissions from the burning offossil fuels．”减少二氧化碳和其他污染物的数量,植物可以吸收对抗所有的排放燃烧矿物燃料。由此可知有些植物不受空气污染影响。故选B。【小题4】细节题：根据最后一段最后一句“urge the Chinese government to take action to reduce emissions from cars and industries.”敦促中国政府采取行动来减少汽车尾气排放和工业。故选D。【小题5】主旨题：全文介绍了臭氧和其他有害气体对植物和农作物的影响和危害。故选A。

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