2, 今昔对比。
    When I was at the age of 7 or 8, I didn’t have in mind something called haze. In those days, the sky was much clearer than it is now. We could breathe freely at that time.
   
    But now, haze is becoming an increasingly serious problem in our daily life. During the days when there is haze in the city, the sky turns grey. On heavy haze days, we even cannot be able to see the sky any more.
   
    I think this change is mainly caused by the development of industry. So we should make a balance
    between social development and environment protection.口语内容充实法1.pdf

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