The way we cook is important. In many countries, the two sources of heat used for cooking are natural gas or electric stoves. The World Health Organization(WHO) 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 cook stoves in the home. 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 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 biomass(生物燃料)and coal stoves.

These findings show that the home use of poisonous fuels is to blame for many of these deaths. These fuels include wood, coal, animal waste and so on. Carlos Dora is Coordinator in the WHO’ s Department of Public Health, Environmental and Social Determinants of Health. He says people should not use unprocessed coal and kerosene(煤油)fuel indoors. He says opening a window or door to let out the harmful air will not correct the situation. It will only pollute the outdoors. “New technologies and clean fuels can rid people of this problem.”

The United Nations found that more than 95 percent of families in sub-Saharan Africa depend on solid fuels for cooking. It says huge populations in India, China and Latin American countries, such as Guatemala and Peru, are also at risk.

Nigel Bruce is a professor of Public Health at the University of Liverpool. He says researchers are developing good stoves and other equipment to burn fuels in a more efficient way.“There are already many technologies for clean fuels available now. An effective and reasonably low-cost ethanol(酒精)stove that is made by Dometic (a Sweden-based company)is now being tested out. Another interesting development is electric induction stoves.” In India, you can buy an induction stove for about $8. And in Africa you can buy a solar lamp for less than $1.

1.How is Paragraph 2 mainly developed?

A. By making classifications. B. By listing numbers.

C. By following time order. D. By describing a process.

2.According to Carlos Dora, what is the best solution to indoor air pollution?

A. People should use an effective air cleaner.

B. People should use new technologies and clean fuels.

C. People should open a window or door to let out the harmful air.

D. People should prevent themselves from being exposed to harmful air..

3.What can we learn from the passage?

A. Most of the deaths from indoor pollution are in developing countries.

B. Burning solid fuels can help limit indoor air pollution .

C. People can buy ethanol stoves made by Dometic in India.

D. There are already two technologies for clean fuels available for use.

4.Which would be the best title for the passage?

A. The way we cook is changing.

B. Cause of indoor air pollution.

C. The development of electric stoves.

D. Indoor air pollution kills millions each year.

Taking a trip to Philadelphia can be rewarding experience or absolute disasters---it all depends on pre-trip homework. To make planning easier, Huffington Post Travel Series recommends attractions for those planning Philadelphia family vacations.

The Philadelphia Museum of Art

Located on 26th Street and Benjamin Franklin Parkway, the Philadelphia Museum of Art features more than 225, 000 pieces in its vast collection, dating back to the first century A.D. Guests can discover modern art exhibits, clothing collections gathered throughout time and classic posters. Audio tours are also available.

Price: adults, $ 16; children 12 to 17, $ 12; children 11 and under, free.

The Please Touch Museum

The Please Touch Museum on 4231 Avenue of the Republic offers kids the chance to explore, discover and learn in a fun environment. The museum features six interactive zones where kids and parents are encouraged to play and learn about science, the environment and more. Exhibits include Flight Fantasy, where kids learn about flying machines, and River Adventures, which teaches kids about science, nature and weather.

Price: adults, $15; children under the age of 1, free

The Philadelphia Zoo

The Philadelphia Zoo sits on a 42-acre Victorian garden. The zoo features 1,300 animals, including a number of rare and endangered species. While visiting the zoo families can see big cats, zebras, giraffes, endangered turtle species and penguins. The zoo also includes rides for kids, such as a Rainforest Carousel and Camel Safari.

Price: Adults, $ 18; children 2 to 12, $15; children younger than 2, free.

The Franklin Institute

The Franklin Institute is Philadelphia’s major science museum, and one of the oldest in the United States. The museum offers guests the chance to experience flight simulator(模拟器)and sky bikes. The first floor offers a large Kid Science exhibit, where children discover science through a fictional journey. The second floor features air shows.

Price: Adults, $ 12; children 4 to 11, $12.

1.One of the features of the Philadelphia Museum of Art is that _______.

A. visitors have access to River Adventures

B. visitors can learn about exhibits using pre-recorded voice introductions

C. it has the cheapest admission fees for adults

D. it offers kids tour rides to see more endangered animals

2.The Please Touch Museum differs from the others mainly because _______.

A. it boasts a number of rare and endangered species

B. it has a large collection of clothing

C. it combines learning with pleasure

D. it includes a large kid science exhibit

3.Teenagers interested in aircraft will most likely to visit both_______.

A. the Philadelphia Museum of Art and the Please Touch Museum

B. the Please Touch Museum and the Franklin Institute

C. the Philadelphia Museum of Art and the Franklin Institute

D. the Philadelphia Zoo and the Please Touch Museum

4.Which group does the Travel Series mainly target?

A. Families with kids

B. Newly-married couples

C. Individual visitors

D. Museum lovers

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