2017高考英语二轮复习讲义(阅读理解)及训练17:(答案)
小试牛刀--------阅读理解
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
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
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