D. Coal burning causes bad air quality in northern China.2. We can infer that ______.

　　A. air quality was better in South China

　　B. southerners don't burn coal for heating

　　C. coal is mainly produced in North China

　　D. coal is no longer used for heating in North China

　　3. According to Greenstone, what greatly contributes to the changes in pollution concentrations in North China?

　　A. Bad weather.

　　B. Sand storms.

　　C. Gases from cars.

　　D. The free heating policy.

　　4. In North China, the free coal policy lasted about ______.

　　A. 2 decades

　　B. 3 decades

　　C. 4 decades

　　D. 5 decades

　　5. What was the concentration of particulates in the south?

　　A. About 184 micrograms per cubic meter.

　　B. About 122 micrograms per cubic meter.

　　C. About 100 micrograms per cubic meter.

　　D. About 55 micrograms per cubic meter.

　　Ⅳ.阅读简答

　　Learning about the death of a loved one can be among life's most stressful events. A recent study showed that the risk of heart attack increases in the days and hours after getting news of such a death. Researchers recently studied nearly 2,000 heart attack survivors. The subjects were asked whether someone close to them had died in the six months before their heart attack.

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