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假如你是李华,是校刊记者。请你为校刊写一篇英语短文,介绍最近在我国很多城市发生的雾霾(haze)天气。请参考以下要点:

1. 危害;

2. 原因;

3. 如何自我防护。

注意:

1. 词数100左右;

2. 开头已给出,不计入总词数。

Recently haze pollution has happened in many cities of China.

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