一、原因 结 果 例：There are probably +[many\several\three]+[resons\causes]+ for this +[dramatic\marked]+[increase\decline\change]+ in... 二、比 较 对 照 例：[There is no doubt that\Obviously,]+ it has [its\both]+[drawbacks\disadvantages\negative effects]+[as well as\and]+[merits\advantages\positive effects]... 三、例 证本文 四六级英语资料下载www.englishw.cn
