考研英语写作常用句型中间句(3)

　　21. Well, why is there ______________? I think there might be two reasons. One is ______________,and the other is ______________.

　　22. There are, I think, two main reasons for ______________. In the first place, ______________. In the second place, ______________. Therefore, ______________.

　　23. Why ______________? For one thing, ______________. For another, ______________. Perhaps the main reason is ______________.

　　24. It is no easy job to find the reasons for this tendency which involves several complicated factors. For some ______________. For others ______________.

　　25. Why ______________? The first reason is that ______________. The second reason is

　　______________. The third is ______________. For all this, the main cause of ______________ is due to ______________.

　　26. It is reasonable to maintain that ______________, but it would be foolish to persist that

　　______________. There are three reasons ______________.

　　27. The explanation for this problem involves many factors. For one thins, ______________. For another,______________. Still ______________.

　　28. The causes for ______________ are varied. They include ______________. Perhaps the main

　　cause is ______________.

　　29. The eventual result it brings out is ______________. And perhaps the most obvious result of

　　______________ is ______________.

　　30. However, just like everything has both its good and bad sides, ______________ also has its own disadvantages, such as, ______________. besides, ______________.