考博英文作文

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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. P
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　　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 ) . t) ;   
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