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         Rooftops covered with plants - called "green roofs" - could help fight global warming, scientists
    now suggest.
         Green roofs are growing more popular in cities, with the number of green roofs increasing in the
    United States. In Germany, widely considered the leader in green roofing, some 12 percent of all flat
    roofs are green, with the German green roof industry growing 10 to 15 percent annually.
         These roofs can reduce heating and air conditioning costs, with a roughly 10 percent reduction in
    natural gas usage and a 2 percent drop in electricity use for a typical building. Moreover, green roofs
    last two to three times longer than standard roofs. They also store storm water, which could otherwise
    exacerbate (加剧)flooding. "They can also bring in birds and butterflies, help improve biodiversity(多
    样性)," Rowe said. In addition to taking in pollution and noise, the plants in green roofs naturally absorb
    carbon dioxide, the leading greenhouse gas behind global warming. However, nobody had measured
    the potential effect of green roofs on carbon dioxide levels until now.
         Scientists at Michigan State University found that replacing traditional roofing materials with green
    roofs in an urban area the size of Detroit, with a population of about one million, would take in more
    than 55,000 tons of carbon. That is roughly similar to getting rid of a year's worth of carbon dioxide
    sent out by 10,000 mid-sized SUVs and trucks.
         The challenges green roofs now face in the United States are something about policy and costs.
    "The government should not necessarily mandate(强制执行) them, but it can provide support for them,
    just as they do in Germany and elsewhere," Rowe told LiveScience. "And green roofs are more
    expensive, but only initially. Over time, they're cheaper once you consider their benefits energy-wise.
    It takes about 11 to 14 years to break even(不赢不亏)."
    1. Which of the following is NOT true?
    A. Green roofs can take in the leading greenhouse gas behind global warming.
    B. It is easier for green roofs to break than standard roofs.
    C. A building with a green roof takes less energy to be heated.
    D. Green roofs are of higher building cost.
    2. We can learn from the passage that___.
    A. Rowe is not optimistic about the future of green roofs
    B. Germany has made it a rule to build green roofs
    C. The United States is widely considered the leader in green roofing
    D. Green roofs can provide habitats for birds and butterflies
    3. The underlined word in the last paragraph is closest in meaning to ____.
    A. at times     
    B. at first  
    C. at present    
    D. at last
    4. Which of the following can be the best title?
    A. Standard Roofs and Green Roofs
    B. Green Roofs Are Growing More Popular
    C. Green Roofs Help Control Global Warming,
    D. Advantages of Green Roofs
    1-4: BDBC
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    科目：高中英语 来源：2010年普通高等学校招生全国统一考试、英语(安徽卷) 题型：050

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    　　The need to feed a growing population is putting much pressure on the world's supply of water．With 97％ of the world's water too salty to be drunk or used in agriculture, the worldwide supply of water needs careful management, especially in agriculture．Although the idea of a water shortage(短缺)seems strange to someone fortunate enough to live in a high rainfull country, many of the world's agricultural industries experience constant water shortages．

    　　Although dams can be built to store water for agricultural use in dry areas and dry seaons, the costs of water redistribution(重新分配)are very high．Notonly is there the cost of the engineering itself, but there is also an environmental cost to be considered．Where valleys(山谷)are flooded to create dams, houses are lost and wildlife homes destroyed．Besides, water many flow easily through pipes to fields,but it cannot be transported from one side of the world to the other．Each country must therefore rely on the management of its own water to supply its farming requirements．

    　　This is particularly troubling ro countries with agricultural industries in areas dependent on irrigation(灌溉)．In Texas, farmers' overuse of irrigation water be resulted in a 25％ redcution of the water stores．In the Central Valley area of south eastern USA, a huge water engineering project provided water for farming in dry vallege, but much of the water use has been poorly managed．

    　　Saudi Arabia's attempts to grow wheat in desert areas have been the pumping of huge quantities of irrigation water from underground reserves．Because there is no rainfall in these areas, such reserves can only decrease, and it is believed that fifty years of pumping will see them run dry．

    (1)

    From the first two paragraphs we learnt that ________．

    [　　]

    A．

    much of the world's water is available for use

    B．

    people in high rainfll countries feel lucky

    C．

    the costs of water redistribution should be considered

    D．

    water can be easily carried through pipes across the world

    (2)

    Which of the following is true?

    [　　]

    A．

    The water in Texas have been reduced by 75％．

    B．

    Most industries in the world suffer from water shortagers．

    C．

    The underground water in Saudi Arabia might run out in 50 years．

    D．

    Good management of water use resulted from the project in the Central Valley．

    (3)

    What is most likely to be discussed in the paragreh that follows?

    [　　]

    A．

    Steps to improving water use managet．

    B．

    Ways tor redjuce the costs of builing dams．

    C．

    Measured to dmal with worldwide water shortages．

    D．

    Appmihes to handling the pressure on water supply．

    (4)

    The text is mainly about ________．

    [　　]

    A．

    water supply and increasing population

    B．

    water use management and agriculture

    C．

    water redistribution and wildlife protection

    D．

    water shornages and environmental protection．

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