<p>考研英语写作常用句型中间句(3)</p>

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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, ______________.