考研英语作文的锦囊句子之中间段4

　　中间段

　　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 ________.