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。Ihas both advantages and disadvantages既有利又有弊。例如：1Obviously television has both advantages and disadvantages2Living in a city has both advantages and disadvantages3Com pared with cars，bikes have their advantages and disadvantages举一反三：1Although computers bring people a lot of convenience，they have many disadvantages2has many advan
