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    阅读理解。

    PM2.5--Killer in China 10:00 a.m. April 1st,2014

    Rank of

    Air Pollution

    City

    AQI

    PM2.5

    μg/m3

    PM10

    μg/m3

    SO2

    μg/m3

    NO2

    μg/m3

    CO

    μg/m3

    O3

    μg/m3

    2

    Sanya

    24

    13

    21

    1

    10

    /

    36

    95

    Shanghai

    72

    52

    71

    13

    48

    1.1

    96

    178

    Harbin

    78

    45

    78

    38

    43

    /

    54

    259

    Beijing

    233

    184

    201

    32

    72

    1.5

    41

    261

    Tangshan

    281

    231

    327

    132

    99

    4.1

    53

    0--50

    Excellent

    Take part in activities &breathe fresh air

    51--100

    Good

    Take part in activities

    101--150

    Light pollution

    Have outdoor activities less

    151--200

    Middle pollution

    Have outdoor activities less

    201--300

    Heavy pollution

    Stop outdoor activities

    >300

    Serious pollution

    Mustn’t go outside

    AQI

    PM2.5细颗粒物。PM10可吸入颗粒。AQI空气质量指数。

    PM2.5（单位：μg/m3）表示每立方米空气中可入肺颗粒物的含量。

    根据表格所提供的信息选择最佳答案。

    1.The AQI in Beijing is much __________ than that in Sanya.

    A. better B. worse C. bad

    2.The air in ___________ is both heavy pollution.

    A. Shanghai and Beijing

    B. Beijing and Tangshan

    C. Tangshan and Harbin

    3.If you are in Tangshan, you had better _________.

    A. have outdoor activities

    B. breathe fresh air

    C. stay at home

    4.The amount of _______in the air in Sanya is the same as that in Harbin.

    A. SO2 B. O3 C. CO

    5.Which of the following is not TRUE according to the information above?

    A. The air in Harbin is middle pollution, we’d better not go out to work.

    B. We can know the AQI of April 1st from the table.

    C. O3 in Shanghai is the most of all the cities.

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