Aprovecho has now partnered with a stove manufacturer in China. The company is making Aprovecho's first mass produced stoves. They are said to use forty to fifty percent less wood than an open fire, and produce fifty to seventy­five percent less smoke. A company called StoveTec is selling them through its Web site for less than ten dollars. Dean still says that more than one hundred thousand have been sold so far.

　　【语篇解读】 本文介绍了Aprovecho研究中心卓有成效的设计——一种价格优廉、效率高、低碳、清洁的炉子。

　　5．The underlined word“biomass”in Paragraph 2 refers to________.

　　A．oil and gas

　　B．wood

　　C．coal

　　D．crop waste or animal waste

　　答案　D　[词义猜测题。根据the richer people use oil and gas可以排除A选项。第一段中介绍发展中国家的人们使用wood，crop waste, animal waste or coal，而biomass所在的句子为People having less money use wood or biomass for cooking，故可排除B选项，煤炭也是需要花钱的，因此最便宜的燃料除了木头就是crop waste, animal waste。]

　　6．The following sentence is taken from the passage, it should be placed at the end of________.

　　The World Health Organization estimates that over 1,500,000 people a year die from breathing smoke from solid fuels.

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