9．
阅读下面材料，从每题所给的三个选项（A、B和C）中，选出最佳选项．
In the months of December and January，China experienced some of the worst air pollution in its history．At times，Beijing's Air Quality Index（AQI）was measured at 406．Any AQI reading over 150is considered"unhealthy"and any reading over 300is considered"hazardous"．In Shanghai，we had several days when the AQI neared 300．The PM2.5readings were also high．PM2.5refers to particulate （微粒的）matter smaller than 2.5microns（微米） in diameter．These particles are small enough to get into the lungs and can cause cancer and other lung diseases．
China is now becoming acutely aware that the rush to development has come at a price and may be endangering the health of its citizens．This is something other countries have faced before．The U．K．used to be the most polluted country in the world．It wasn't until London's Big Smog of 1952that people realized that air pollution was a real health hazard．Twelve thousand deaths were directly related to that"pea-souper（浓雾）"and it resulted in Parliament（英国议会）passing the Clean Air Act（《清洁空气法案》）of 1956．
China will no doubt pass similar laws．It's a choice between wealth and health．As Beijingers and Shanghainese coughed their way through December and January，the choice may have become easier to make．
76．According to the following AQI，if you are inBnow，it is healthy for you．
A．Shanghai．
B．Guangzhou．
C．Beijing．
77．Why did Parliament pass the Clean Air Act of 1956？A
A．Thousands of people died because of the"pea-souper"．
B．The PM2.5readings were very low in UK．
C．The Parliament wanted to pass more laws．
78．Which of the following is True according to the passage？B
A．The U．K．is the most polluted country in the world now．
B．PM2.5may cause cancer and other lung diseases．
C．China will not pass similar laws like the Clean Air Act．
79．The underlined word"hazardous"means"A"in Chinese．
A．危险的
B．温和的
C．健康的
80．According to the passage，why will China pass laws to make air cleaner？C
A．It may help the country develop more rapidly．
B．People can't make the choice between wealth and health．
C．People realize air pollution was a real health hazard．
