表示原因的句型
　　1．The change in__________lalgely results from the fact that__________．
　　2．We mayblame__________．butthe teal causes ale__________．
　　3．Part ofthe explanations for it iS that__________．
　　4．One ofthe most common factors／causes iS that__________．
　　5．Another contributing factor／cause is __________ ．
　　6．A number of factors are accountable for mis situation．
　　7．This might contribute to/lead to/account for the phenomenon/ problem．
　　8．The answer to this problem involves many factors．
　　9．The Dhenomenon mainly stems from the fact that__________．
　　10．The factors that contribute to this situation include__________．
　　11．Perhaps the primary factor is that__________．

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