Hu Li's heart sank due to the color of the air.Driving 140 kilometers from Tianjin City to Beijing last week，she held her breath as the air became a charcoal grey haze(炭灰色的阴霾)．The 39yearold businesswoman has lived in Beijing for a decade，and this past month，she said，brought the worst air pollution she has ever seen.It gave her husband a cough and left her sevenyearold daughter housebound(足不出户)．“My husband as well as I is working here，so we have no choice，” she said.“But if we had a choice，we'd like to escape from Beijing.”
The extended heavy pollution over the last month，which caused punishment in return for a day last week－called the “airpocalypse” by internet users－ has largely changed the way that Chinese think about the country's air.On one day，pollution levels were 30 times higher than levels considered safe by the World Health Organization (WHO)．Flights were cancelled.Roads were closed.One hospital in east Beijing reported they had treated more than 900 children for breathing issues.Bloomberg found that for most of January，Beijing's air was worse than that of an airport smoking area.
The smog's(烟雾) most threatening aspect is its high concentration(浓度) of PM 2.5 － particulate matter that is small enough to breathe deep into the lungs and enter the bloodstream，causing breathing infections，lung cancer and possibly damaging children's development.The WHO has estimated that outdoor air pollution accounts for two million deaths per year，65% of them in Asia.
【小题1】Which conclusion can we draw from the first paragraph?A．Hu Li is living in Beijing.B．Hu Li traveled to Tianjin for business.C．The haze is harmful to people.D．The pollution is the worst in Beijing's history.【小题2】The haze affected people mainly in ．A．the way they traveledB．the opinion about national airC．the way they lived their lifeD．the life style of internet【小题3】From the passage we know high concentration of PM 2.5 ．A．can lead to chokeB．can cause heart cancerC．will damage children's developmentD．will damage people's organ【小题4】What's the best title for the passage?A．Hu Li's attitudes to Beijing's hazeB．The damages of Beijing's hazeC．WHO suggests improving Beijing's airD．What caused air pollution in BeijingC
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(答案→)C
解析： 本文主要以北京为例谈论了雾霾天气对人体的不良影响。
【小题1】C 推理判断题。根据第二句中的“she held her breath...”以及“It gave her husband a cough and left her sevenyearold daughter housebound”可知答案。
【小题2】B 细节理解题。由第二段首句“The extended heavy pollution...has largely changed the way that Chinese think about the country's air.”可知答案。
【小题3】D 细节理解题。由最后一段的“...is small enough to breathe deep into the lungs and enter the bloodstream，causing breathing infections，lung cancer and possibly damaging children's development”可知D项正确，高浓度的PM 2.5会对人的内脏造成危害。
【小题4】B 主旨大意题。文章首段讲雾霾对Hu Li一家的影响；第二段讲严重的雾霾对市民生活造成的具体影响；尾段讲高浓度的PM 2.5的具体危害，B项涵盖了以上内容。