Breathing this air day in day out eventually causes a lot of diseases:more than a third of the 4.3 million die of a stroke,while a quarter die of heart disease.And around one-third of annual lung disease deaths worldwide are due to waste from coal stoves.

　　Exposure tends to be extremely harmful for the people who spend the most time around the fire—usually women and young children.In fact,the WHO reports that household air pollution almost doubles the risk for childhood lung disease.

　　1.According to Kirk Smith’s research,　. 

　　A.factories are the biggest killer worldwide nowadays

　　B.burning 400 cigarettes an hour is extremely dangerous

　　C.household air pollution from cooking is surprisingly harmful

　　D.some 4.3 million people die earlier each year than they should

　　2.What should be the deadly killer in a household kitchen?

　　A.Cooking smoke. B.Coal.

　　C.Poor gas. D.Wood.

　　3.The underlined word “ventilation” in Paragraph 4 probably means 　. 

　　A.cooking　 B.airing　 C.burning　 D.cooling

　　4.The author intends to tell people 　. 

　　A.how to avoid polluted air in their homes

　　B.to stop cooking in the household kitchen

　　C.how to prevent childhood lung diseases in household

　　D.to guard against household pollution from cooking

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