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河北省2017高考英语二轮复习专题训练： 短文改错+书面表达（3） 短文改错The world is not only hungry, but also thirst. This may sounds strange, since nearly seventy percent of the earth's surface is covered with water. But about ninety percent of this is sea water. Man and most of the animals can only drink and use the remained ten percent of water --- fresh water. The need for water is increased day by day. Only when steps are taken to deal with this problem immediate can we avoid a severe worldwide water shortage later on. One of the first steps are to develop ways to reuse them. Experiments have already carried out in this field. The used water has been pumped to a water purifying plant that it can be separated from waste matters and treated with chemicals so that it can be reused again. 书面表达Should Our Parents Accompany Us in Studying at School? In recent years, many parents choose to accompany their children in studying, which has aroused a wide concern. These parents are willing to leave their hometown, even quit their jobs to follow their children into the campus. Most of them rent an apartment nearby so as to take good care of their children. Parents consider it necessary to offer a better living condition to the kids. Meanwhile, it can allow them to keep track of the kids’ academic performance. Nevertheless, what they’ve ignored is that it will get their kids into the habit of being dependent. Thus, they will never develop the ability of self-control in the future. | 
