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 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(加劇) flooding. “ They can also bring in birds and butter flies ,help improve biodiversity(多樣性) , ” 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, 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 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(強(qiáng)制執(zhí)行) them, but it can provide support for them, just as they do in Germany and elsewhere, ” Rowe told live Science. “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. ”

64．What can we infer from the passage?

A. Green roofs are becoming more popular in cities and rural areas.

B. These roofs can decrease heating and air conditioning costs.

C. “Green roofs” is of great benefit to control global warming.

D. Green roofs now face the challenges of law and technology.

65．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.

66．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 attract birds and butterflies

CBD

本文講了綠色屋頂?shù)陌l(fā)展近況和前景，以及為我們生活環(huán)境帶來的好處。

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Driving to a friend's house on a recent evening, I was attracted by the sight of the full moon rising just above my friend’s rooftops. I stopped to watch it for a few moments, thinking about what a pity it was that most city people? Myself included? Usually miss sights like this because we spend most of our lives indoors.
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I know the feeling. Last December I took my seven-year-old daughter to the mountainous jungle of northern India with some friends. We stayed in a forest rest-house with no electricity or running hot water. Our group had campfires(篝火) outside every night, and indoors when it was too cold outside. The moon grew to its fullest during our trip. Between me and the high mountains lay three or four valleys. Not a light shone in them and not a sound could be heard. It was one of the quietest places I have ever known, a bottomless well of silence. And above me was the full moon, which struck me deeply.　　  
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Struggling through traffic that evening at the end of a tiring day, most of it spent indoors, I thought: before long, I would like to live in a small cottage. There I will grow vegetables and read books and walk in the mountains. I may become an old man there, and wear the bottoms of my trousers rolled and measure out my life in coffee spoons. But I will be able to walk outside on a cold silent night and touch the moon.
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C．explain that people have fewer chances to enjoy nature
D．show that we can also enjoy nature at home through them
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A．express the feeling of returning to nature
B．show the love for the moonlight
C．a(chǎn)dvise modern people to learn to live
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C
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