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說明原因型作文
　　Nowadays ,there are more and more ______A(代表一種現(xiàn)象)in some big cities . It is estimated that______(用具體數(shù)據(jù)說明該現(xiàn)象) Why have there been so many A ?

　　Maybe the reasons can be listed as follows. The first one is that_____(原因一) .Besides, _____________(原因二) . The third reason is _________( 原因三).To sum up ,the main cause of A is due to _______( 指出主要原因) .

　　It is high time that something were done upon it. For one thing,________ (解決建議一).On the other hand ,_______(解決建議二). All these measures will certainly reduce the number of A.