Lastweek'sairqualitywasbetterinmostpartsofChinathantheprevious（早先的）week'sasthetemperaturedroppedgreatlyinnearlyallthemajorcities.LanzhoucapitalofNorthwestChina'sGansuProvincemeasu

Question

　　Last week's air quality was better in most parts of China than the previous（早先的）week's as the temperature dropped greatly in nearly all the major cities.

　　Lanzhou capital of Northwest China's Gansu Province measured the week's worst score on Thursday 194 on the air quality index--a medium（中间的）level of pollution.

　　Beijing's air quality was good scoring below 100 on the index. Other major cities' air pollution was generally as good as the previous week. Air quality in 10 cities was good with the air quality below 50 on the index in Suzhou Nantong Hangzhou Nanchang Zhuhai Zhanjiang Lhasa Haikou and Kunming. There were 23 cities with air quality registering（记录） below 100 including Beijing Shenyang Changchun Xi'an Chengdu Shanghai Harbin Guangzhou Qingdao Changsha Guiyang and Wuhan. Another six cities Xining Tianjin Shijiazhuang Taiyuan Lanzhou and Urumqi were slightly polluted with readings of over 100. Suspended（悬浮）particles（微粒）were the major pollutants in 28 cities including Beijing Tianjin Taiyuan Harbin Hohhot Shenyang Changchun Hangzhou Hefei Wuhan Xining Yinchuan Chengdu Lanzhou and Urumqi. Nitrogen（氮）oxide（氧化物）was the main pollutant in Changsha Chongqing and Guiyang.

(1) In the four cities _______ air quality was the best.

[　　]

A．Beijing's

B．Shanghai's

C．Guangzhou's

D．Suzhou's

(2) According to the passage which one of the following is different from the others?

[　　]

A．Beijing

B．Wuhan.

C．Shenyang

D．Changsha

(3) The passage mainly wants to tell us ._______.

[　　]

A．last week's air quality was better than the previous week's

B．lots of major cities' air pollution was as good as the previous week

C．air quality in 10 cities was good

D．suspended particles and Nitrogen oxide were the pollutants

Answer 1

答案：D;D;A
解析：
(1)从文中可知苏州的空气质量指数为50以内，比其余的三个城市都低． (2)本题要找出与其余三个不同类的城市，从文中我们知道作者从空气指数及污染源方面作过区分，从前者来看四个城市的空气指数都在50--100之间，从后者来分，北京、武汉、沈阳的污染源是suspended particles 而长沙是Nitrogen oxide. (3)本文的主题是讲述空气质量的好转，其余均为辅助说明，所以正确答案是A．