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The World Health Organization warns that millions of people are dying every year from indoor air pollution. The WHO finds that poor cooking, heating and lighting technologies are killing millions of people each year. Indoor air pollution results from the use of dangerous fuels and cookstoves in the home. To help fight the problem, the WHO announces new guidelines aimed at reducing household pollutants.
WHO officials say nearly three billion people are unable to use clean fuels and technologies for cooking, heating and lighting. And they say more than seven million people die from exposure（暴露）to indoor or outdoor air pollution each year. Of that number, the WHO says about 4.3 million people die from household air pollution given off by simple coal cookstoves. WHO officials say indoor pollution leads to early death from strokes, heart and lung disease. The main victims（受害者）are women and girls in developing countries, where they usually stay at home and do the household work.
Carlos Dora, an official of the WHO, says people should not use unprocessed coal and kerosene indoors. He says opening a window or door to let out the harmful air will not improve the situation. It will only pollute the outdoors.
Nigel Bruce is a professor of Public Health at the University of Liverpool. He says researchers are developing good cookstoves and other equipment to burn fuels in a more efficient way.
WHO experts note some new, safe and low-cost technologies that could help are already available. In India, you can buy an induction cooker（电磁炉）for about $ 8.00. And in Africa you can buy a solar lamp for less than $ 1.00. But, this, the WHO says, is just a start. It is urging developing countries to use cleaner fuels and increase access to cleaner and more modern cooking and heating equipment.
21．What does the underlined phrase “the problem” in paragraph 1 refer to?
A．Indoor air pollution. B．Cooking habits.
C．Poor cookstoves. D．Use of natural gas.
22．Why are women and girls in developing countries the main victims of the indoor pollution?
A．They are very weak.
B．They are more sensitive to the indoor pollution.
C．They are exposed to the indoor pollution more.
D．They seldom do exercise outdoors.
23．Which of the following is a good way to avoid indoor air pollution?
A．To open a window while cooking.
B．To use unprocessed coal indoors.
C．To promote the cleaner and modern cooking equipment.
D．To popularize the traditional cookstoves at home.
24．What is the best title of the text?
A．How to prevent pollution
B．How to protect women and girls
C．Indoor pollution kills millions each year
D．The importance of health in developing countries
