一、开头句型
我们常说，良好的开端等于成功的一半。做事如此，作文也是如此。所以我们颇有必要在作文的开头花一番心思。在写议论文时，你通常以什么样的方式开头呢？最简单也最常用的可能就是开门见山法。也就是说———直截了当地提出你对这个问题的观点，点出文章的中心思想。
I．．．．has both advantages and disadvantages．……既有利又有弊。例如：
1．Obviously television has both advantages and disadvantages．
2．Living in a city has both advantages and disadvantages．
3．Compared with cars，bikes have their advantages and disadvantages．
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