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（中間的）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（記錄） 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（懸浮）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．a(chǎn)ir quality in 10 cities was good

D．suspended particles and Nitrogen oxide were the pollutants

答案：D;D;A
解析：

(1)從文中可知蘇州的空氣質(zhì)量指數(shù)為50以內(nèi)，比其余的三個(gè)城市都低．

(2)本題要找出與其余三個(gè)不同類的城市，從文中我們知道作者從空氣指數(shù)及污染源方面作過區(qū)分，從前者來看四個(gè)城市的空氣指數(shù)都在50--100之間，從后者來分，北京、武漢、沈陽的污染源是suspended particles,而長沙是Nitrogen oxide.

(3)本文的主題是講述空氣質(zhì)量的好轉(zhuǎn)，其余均為輔助說明，所以正確答案是A．


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