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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