一．开头用语：
良好的开端等于成功的一半．在写作文时，通常以最简单也最常用的方式---开门见山法。也就是说, 直截了当地提出你对这个问题的看法或要求，点出文章的中心思想。
１．议论论文：
A. Just as every coin has two sides, cars have both advantages and disadvantages．
B. Compared to/ In comparison with letters, e-mails are more convenient.
C. When it comes to computers, some people think they have brought us a lot of convenience. However,...