干旱的世界英语四级作文
the world is not only hungry, it is also thirsty. this may sound strange, since nearly seventy percent of the earths 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 remaining percent of water--fresh water.
the need for water is increasing day by day. only steps are taken to deal with this problem immediately can we avoid a severe world-wide water shortage later on. one of the first steps is to develop ways to reuse it.
eperiments have already keen carried out in this used witer has been pumped to a water-purifying e, it can be separated from waste matter and treated with chemicals so that it can be used again, just as if it were fresh water from a spring.
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在学习、工作乃至生活中,大家都不可避免地要接触到作文吧,作文是由文字组成,经过人的思想考虑,通过语言组织来表达一个主题意义的'文体。作文的注意事项有许多,你确定会写吗?以下是小编为大家收集的如何使用图书馆英语四级作文,欢迎大家分享。如何使用图书馆英语四级...