近年来我国多地雾霾天气不断增多，极大地影响了人们的健康与生活。作为环境保护的一个近期热点话题，雾
Bikes or Cars Americans like to go out by car. A
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For my part, I stand on side of the former opini
Nowadays, many school students smoke, and the nu
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As the keen competition becomes more common in o
