本文格式为Word版，下载可任意编辑大学英语四级听力训练 英语四级听力在线播放 高校英语四级听力训练不在一朝一夕，而在于长长期久的决心。下面是我给大家整理的高校英语四级听力训练美文的相关学问，供大家参阅! 高校英语四级听力训练美文1 Hotter or Colder ? It was once thought that air pollution affected only the area immediately around large citieswith factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem isliterally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has
