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         China's government has been trying all measures to reduce pollution in the past few years. Now people
    can enjoy a fresh environment everywhere. The following two graphs are adopted from the column of "City
    Information" on the webpage of Beijing Review.
    Graph 1: Olympic Cities Air Quality Report
    City Date API Major Pollutant Air Quality Degree Quality Condition
    Beijing Sep. 8 37 N/A Ⅰ Very good
    Qinhuangdao Sep. 8 52 PM10 Ⅱ Good
    Qingdao Sep. 8 68 PM10 Ⅱ Good
    Shanghai Sep. 8 67 PM10 Ⅱ Good
    Shenyang Sep. 8 88 PM10 Ⅱ Good
    Tianjin Sep. 8 54 PM10 Ⅱ Good
    Graph 2: Chinese National Standard
    API Values Levels of health concern Colors
    When the API is in this range: ...air quality conditions are: ...as symbolized by this color:
    0 to 50 Very good Blue
    51 to 100 Good Green
    101 to 150 Slight pollution Yellow
    151 to 200 Moderate pollution Orange
    201 to 250 Medium pollution Red
    251 to 300 High pollution Purple
    301 to 500 Hazardous Brown
    Notes:
       **API stands for Air Pollution Index(指数).
       **Particulate matter (PM10) is a major component of air pollution that threatens both our health and our
    environment. It consists of very small liquid and solid particles floating in the air.
       **Sulfur dioxide(SO2) acts as an acid．Inhalation(吸入) results in labored breathing, coughing, or a
    sore throat and may cause permanent lung damage.
    1. According to Graph 1, which of the following cities has the worst air pollution?
    A. Qinhuangdao.    
    B. Tianjin.
    C. Qingdao                
    D. Shenyang.        .
    2. If your city is symbolized by either red or purple, the pollution in your city is      .
    A. Moderate or high.        
    B. Moderate or slight.   
    C. Medium or high.        
    D. Medium or slight.  
    3. Which of the following statements is TURE?
    A. With API value below 150 the air is free from being polluted.
    B. The colors from purple to Yellow indicate the air quality is becoming much worse.
    C. When there are floating solid particles and dust in the air, it is dangerous pollution.
    D. On September 8th the color-symbol of Beijing City's air quality is 'Blue'.
    4. When more citizens are beginning to have labored breathing soon after they are in the open air, it suggests that             .
    A. there is a large amount of sulfur dioxide in the air
    B. it is so cold that they may have caught a cold
    C. they are starting to cough or have a fever
    D. they must be infected with permanent lung disease
    1-4: DCDA
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