4．According to the passage，which conclusion is WRONG?

　　A．Sometimes green roofs may break down the house.

　　B．Not all the green roofs can reduce the building's air conditioning costs equally.

　　C．Different designs of green roofs have different effects on buildings.

　　D．Sedums are a kind of plants of native to Texas.

　　答案　D　[细节理解题。根据第三段中的rooftop gardeners have to be careful not to put too much weight on the roof可推出A项正确；根据最后一段中的But they also reported that not all green roofs perform equally well可知 B项正确；根据最后一段中的They found that designs differ in their ability to keep buildings cool and to capture rainwater可知C项正确；根据最后一段倒数第二、三句可知sedums不是Texas当地的植被。]

　　B

　　More than three billion people are at risk from indoor air pollution because of the heating or cooking fuels they use. Most live in Africa, India and China. They use biomass fuels like wood, crop waste, animal waste or coal. These solid fuels may be the least costly fuels available. But they are also a major cause of health problems and death.

　　The Aprovecho Research Center has been designing cooking stoves for the developing world. People having less money use wood or biomass for cooking;

　　the richer people use oil and gas. It's been estimated that wood is running out more quickly than oil and gas.

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