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      1. People used to burn       (煤)to cook or keep warm.

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        Have you ever paid attention to the Air Quality Index (空气质量指标）or AQI reported in the newspaper? The AQI helps us understand what the air quality around us means to our health. The AQI uses colors,numbers and words to tell us about the air. Let's see what these colors and numbers mean.

      AQI colors

      AQI numbers

      Health word( s)

      What to do

      Green

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      Moderate(适中)

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      201-300

      Very unhealthy

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      根据短文内容，选择最佳答案。

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      A. orange B. red

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      C. bigger;nicer

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      C. People with lung disease are very sensitive to the air.

      D. The AQI can't help people know the air quality.

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