模块（一）

　　nowadays ,there are more and more xx in some big cities . it is estimated

　　that ( 1 ).

　　why have there been so many xx ? maybe the reasons can be listed as follows.

　　the first one is that ( 2 ) .besides,( 3 ) . the third reason is ( 4 ).

　　to sum up ,the main cause of xx is due to ( 5 ) .

　　it is high time that something were done upon it. for one thing ,( 6 ).

　　on the other hand ,( 7 ). all these measures will certainly reduce the

　　number of xx .

　　注释：

　　（1）用具体数据说明xx现象

　　（2）原因一

　　（3）原因二

　　（4）原因三

　　（5）指出主要原因

　　（6）解决建议一

　　（7）解决建议二

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