The group has made stoves using mud, bricks, sheet metal, clay, ceramics and old oil drums. Most of the stoves look like large, deep cooking pots. They have an opening at the bottom for the fire and a place on top to put a pot.
In the late nineteen seventies, Aprovecho produced a popular stove called the Lorena. The Lorena was very good at reducing smoke and warming homes. But new tests years later found that it was not very efficient. The Lorena used twice as much wood as an open fire, and took much longer to heat food. Since then, they have experimented with countless other designs.
Their goal is to make a very inexpensive stove-let's say five dollars-that makes very, very little smoke, so it's safe for health and global warming and deforestation(采伐森林).
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________.
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