汉生：乐乐， 你怎么感冒了？    乐乐：这几天忽冷忽热的，一不小心就感冒了。    汉生：这几天的天气是挺反常的，刚刚还晴空万里，看，现在又乌云密布了。    乐乐：对呀，前天天气预报说昨天晴天，气温也不低，我就高高兴兴地穿了裙子，哪里想到下午就变天了，冻得我全身发抖。这不，今天就感冒了。    汉生：对付这种天气，还是多穿点好。     Han Sheng：Le Le, how did you get cold?
Le Le：The temperature changes from time to time these days. I got cold because of my carelessness.
Han Sheng： The weather is quite abnormal.Just now it's shining sunny. But now it's full of heavy clouds.
Le Le：Right.The day before yesterday weather forecast said it's sunny yesterday and the temperature is not low. I dressed a skirt happily. Who knows it changed that afternoon. I shaked all over because of the cold. Therefore, I got cold.
Han Sheng：It's better to wear warm in such weather.

Le Le：

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• yesterday [´jestədi]   n.&ad.昨天；前不久   (初中英语单词)
• therefore [´ðeəfɔ:]   ad.&conj.因此；所以   (初中英语单词)
• available [ə´veiləbəl]   a.可用的；有效的   (初中英语单词)
• summary [´sʌməri]   a.&n.摘要(的)   (英语四级单词)
• forecast [´fɔ:kɑ:st]   vt.&n.预测；预报   (英语六级单词)