Air pollution contributes to a variety of ailments that eventually lead to premature mortality like lung cancer，stroke and heart failure，according to the study.Another study published this week in the journal Environmental Health Perspectives reached similar conclusions showing the devastating (毁灭性的) effects of pollution on individual health.Researchers found that chronic exposure to particulate matter increases the chance of early death by 3%.That risk is especially high for heart disease；the chance a person will die of heart disease increases by around 10% with chronic exposure to particulate matter.

　　Researchers found that the number of deaths is expected to double by 2050 without new government policies.Nearly all of the increase will occur in Asia，according to the report.

　　5．Which of the following contributes to the air pollution?

　　A．Particulate matter.

　　B．Ozone.

　　C．Smoke.

　　D．Both A and B.

　　答案　D

　　解析　细节理解题。根据第二段第一句和最后一句，可知悬浮微粒和臭氧导致了空气污染。故选D。

　　6．Which of the following is NOT true?

　　A．Residential heating emissions cause two thirds of air pollution­related deaths worldwide.

　　B．7 million deaths occur annually due to air pollution.

　　C．Air pollution from agriculture kills more than 600,000 people annually.

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