套路： 来源：考试大 there are many factors that may account for／contribute to／responsible for the reason why．．．，but the following are the most typical ones．first，．．．besides／furthermore／moreover／in addition／what’s more，．．．most important of all／above all，．．． all in all／in conclusion，．．．
【范文】
why i took geography as my major 来源：考试大 there are many factors that may account for the reason why i took geography as my major，but the following are the most typical ones． 来源：考试大 first，the problem of global environment pollution is serious．each year，a lot of people die from it．therefore，i decide to learn geography to do something to make the world cleaner．furthermore，our great china has many resources that have not been found yet．as a chinese，i think i can use my knowledge of geography to make full use of these resources． most important of all，the horizon of geography is very wide．it includes physics，chemistry and other fields．i can become more knowledgeable by taking geography as my major． 来源：考试大 in conclusion，i take geography because i really like it．and i am sure this major will helpme become a useful person．