Dangerous factors (因素) include indoor and outdoor air pollution, water pollution.

Another study showed that parents and scientists from seven countries including the United States and India think pollution is the biggest threat (威胁) to childrens living environment.

Mrs Green tries to teach her daughter Susan by setting a personal example. She picks out recyclable (可回收的) waste and uses the water from the washing machine to wash the toilet.

Chinese children mostly learn about environmental protection in school. Some non-governmental organizations and child centres also teach kids to protect the environment. More parents have known about it. Family is now playing a more important role, says a Chinese official.

Vera Lehmann, a German scientist says many Chinese now think more of pollution. I was surprised to find many schools in China are willing to educate the children on environment, Lehmann said. There has been a big change between now and ten years ago when I first travelled here.

( )31. What is the main cause of child deaths?

A. Polluted water.

B. Poor education.

C. Environmental problems.

D. Indoor and outdoor air pollution.

( )32. How many dangerous factors are talked about in the article?

A. One.B. Two.

C. Four.D. Five.

( )33. From the example of Mrs Green, we can know that she 　　　.

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