More than three billion people are at risk from indoor air pollution because of the heating or cooking fuels they use. Most live inAfrica, India and China. They use wood, crop waste, animal waste orcoal. These solid fuels may be the least costly fuels available. Butthey are also a major cause of health problems and death.
The Aprovecho Research Center has been designing cookingstoves for the developing world. People having less money use woodor biomass for cooking; the richer people use oil and gas. It's estimated that wood is running out more quickly than oil and gas.
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 fireand a place on top to put a pot.
In the late 1970s, Aprovecho produced a popular stove calledthe Lorena. The Lorena was good at reducing smoke and warminghomes. But new tests years later found that it was not efficient. Theused twice as much wood as an open fire, and took muchlonger to heat food. Since then, they have experimented with count-less other designs.
Their goal is to make an inexpensive stove—let's say fivedollars— that makes little smoke, and it's safe for health and reducesglobal warming and deforestation(采伐森林).
Aprovecho has now partnered with a stove manufacturer inChina. The company is making Aprovecho's first mass producedstoves. They are said to use 40% - 50% less wood than an openfire, and produce 50% -70% less smoke. A company called Stove-Tec is selling them through its Web site for less than ten dollars. Dean Still says that more than one hundred thousand have been soldso far.
The underlined word " biomass " ，in Paragraph 2 refers to __________

A．oil and gas	B．wood
C．coal	D．crop waste or animal waste

The following sentence is taken from the passage, it is probablyplaced at the end of __________.
A World Health Organization estimate that over 1,500,000 people a year die from breathing smoke from solid fuels.

A．Paragraph 1	B．Paragraph 2
C．Paragraph 3	D．Paragraph 4

Which information about the Lorena mentioned in Paragraph 4is WRONG?

A．It was a popular stove which began to produce in 1970.

B．It was able to be used to bring down smoke.

C．It was good at heating houses.

D．It turned to consume more fuel later.

Stoves the Aprovecho Research Center has been designingshould have the following characteristics ：__________.
（1）enormous （2）costly （3）efficient (4)low-carbon (5)cleaner

A．1. 2. 4	B．3. 4. 5.
C．2. 3. 5.	D．1. 3. 4.

You can probably read the passage in a magazine about __________
A climate change
B. financial crisis
C. an environmentally-friendly life
D. commercial advertisement