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历年高考英语作文的评分标准明确提出，应根据文章的内容和语言初步确定其所属档次，最后给分。其中特别强调上下文的连贯性，即行文连贯。
所谓行文连贯，也就是“有效地使用了语句间的连接成分”，即通过使用过渡性词语来控制整个描述过程，这是区分书面表达水平的重要标志之一。但我们必须明确：并不是句子长，句型复杂，就能使短文连贯，而是需要正确使用各种短语、固定用语和句型来连接上下文，确切地表达意思. 因此,正确使用过渡性词语是行文连贯的关键环节.
过渡性词语包括关联词和连接词两大类。

一关联词：其根据句间关系可分为以下几种：

1 条件关系：如果，只要：if , on condition that, as long as, so long as
除非，如果不：unless
否则：or else, otherwise
2 递进关系：另外，还有：what is more, besides, also, moreover,       in addition to, apart from
3 转折关系：但是，然而，相反：but, however, yet, instead,
on the other hand,     on the contrary, while.
4 因果关系：所以，因此：so, thus, therefore, as a result
            因为：because, since, as, for
            既然：now that
5 目的关系：为了：to, in order to/that, so as to/that, for the purpose of
6 让步关系: 尽管, 即使:although, though, as, even though, even if,
no matter wh-, wh-ever.

   二连接词：常见的连接词包括以下几种

1 换句话说：in other words, that is to say, to put it another way，that is.
2 实际上： in fact, actually, as a matter of fact
说实话,说真话：to tell the truth
3总而言之，总的来说：on the whole, in short, all in all ,
in general,   in a word
     4 信不信由你： believe it or not
     5 例如： for example, such as, take….for example
     6 在我看来, 我认为:I think, in my opinion, personally
     7 序数: 首先,其次,接着,最后; 第一,第二,第三…….最后.
            1) firstly, secondly, then, thirdly…..lastly.
            2) First, second, then ,third….. last.
     8 确信Sb’s sure that….., It’s certain that sb.….., Sb is certain that…..
     9 糟糕的是: what’s worse, to make matters worse
为了确切地表达句子间和段落间的意思，学生在练习写作时，必须牢记以上过渡性词语的确切含义并根据上下文熟练地加以运用。有效使用过渡性词语有着非常重要的作用。一方面，它可以美化句子，增强语句的节奏，韵律和文采；另一方面它可以更加紧密地连接上下文，理顺句间关系。
请看下面一篇文章：2008年将在北京举办第29届夏季奥运会，你班特意召开了一次班会，对其将给北京带来的正反影响展开了激烈的讨论。假如你是Tom，现请根据下表讨论结果给21世纪报的编辑写一封信，并谈谈你个人的看法。
积极影响消极影响
1调动北京人民学习英语的积极性，了解世界。 1交通拥挤，出行不便
2增加就业、促进旅游业和经济的发展。 2造成污染、破坏环境
3 美化北京首都。 3资源浪费：人力，物力，财力
4让世界更了解中国。
通过认真审题发现其文体是书信，人称应该采用第一人称，时态是现在时和将来时.从上面表格要点可见,应该从正反两方面谈论给北京带来的影响.为了上下文的连贯, 需要适当运用一些过渡性词语，请看下面范文：
Dear Editor，
    The 29th Olympic Games will be held in Beijing in 2008．In order to learn something more about it, recently our class have had a discussion about its effects on Beijing．
    Some students believe there are many good effects．Firstly they think the Olympics will encourage people in Beijing to study English harder to understand the world. Secondly it’s useful to help more people find jobs and prosper tourism and economy. Besides it will make Beijing more beautiful and make China better known to the world．
On the contrary, the others think the Olympics will also bring some trouble．For example，at that time，the traffic will be heavier and the environment will be destroyed．Furthermore，holding the Olympic Games will also cause more pollution and waste resources such as money, labor