精选优质文档-倾情为你奉上英语四级作文万能模板1、话题作文 Nowadays, there are more and more _X_ in _X_ . It is estimated that _X_ . Why have there been so many _X_ ? Maybe the reasons can be listed as follows. The first one is _X_ . Besides, _X_ The third one is _X_ . To sum up, the main cause of it is due to _X_ . It is high time that something were done upon it. For one thing _X_ . For another thing, _X_ . All these measures will certainly reduce the number