标签：话题作文 话题 英语四级作文
字数：1200字
提要：Water Pollution-水污染 由英语作文网收集整理 英语作文网 Water Pollution Water pollution is caused by waste from factories and cities. Oceans are able to clean themselves, but certain seas, once they become dirty, are not able to do so. One example is the Mediterranean which lies between Europe and Africa. It has onlyeone narrow entrance to the ocean in the west. On quarter of the shores of the Medi..