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    Air quality in Shanghai worsened last week compared with the previous week, according to the latest report from the Shanghai Environment Monitoring Centre.

    The average air pollution index (API) for sulphur dioxide (SO2) remain almost unchanged from the previous week, but the APIs for nitrogen oxide (NOx) and total suspended (悬浮) particles (TSP) rose by 35 and 27 percent.    The overall quality still belonged to class 2 category. Nitrogen oxide, caused mainly by vehicle exhaust and burning of cooking gas, was still the major pollutant of the week.

    The Shanghai Environmental Monitoring Centre operates six automatic air monitors in the city’s Putuo, Yangpu, Luwan, Hongkou, Jing’an and Xuhui districts.

    API

    140

    120

    100

    80

    60

    40

    20

     

     

    NOX

    SO2

    TSP

     

     

     

     

     

     

     

           0   12      13       14       15      16       17      18(October)

    0-50: excellent               51-100: good           101-200: slight pollution

    201-300: medium pollution     301-400: heavy pollution

    1.Judging from the chart, on which day was the air quality the worst?

    A. October 13.         B. October 14.        C. October 17.              D. October 18.

    2.Which of the following can be used to describe the air quality of the week?

    A. GoodB. Seriously polluted.  C. Excellent.      D. Slightly polluted.

    3.Six automatic air monitors are operated in the city except ________.

    A. Putuo District      B. Xuhui District     C. Chang’an District D. Hongkou District

    4.In Shanghai, nitrogen oxide mainly comes from ________.

    A. the burning natural gasB. the burning cooking gas

    C. the burning coal                       D. dust raised by vehicles

     

    【答案】

    1.B

    2.A    

    3.C

    4.B

     

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