第三段的中心思想表达了写摘要的广泛用途。
摘要：
the ability to write summaries reflects one‘s reading comprehension level.if one has a better understanding of the structure of an article and a better grasp of the main idea，he can write the summary efficiently.moreover，a summary，if accurate and wellwritten，can stand the test of time.many professions require their staff to possess the ability of writing summaries such as doctors，lawyers，junior executives and students.
五、常用过渡词和句型
过渡词在文章中发挥着连接上下文的作用，学会恰当地运用过渡词会使文章连贯、流畅。本节提供的过渡词都是最基本的，考生在时间紧、工作繁忙的情况下，可根据自己的喜好，掌握各类中的二至三个用法即可。
1.常用于文章开始的过渡词语和句子
(1)to begin with首先
例：to begin with，smoking should be banned in public areas.首先，公共场所禁止吸烟。
(2)generaby speaking一般地说，总体上说
例：generally speaking，it is the best policy to spend more money on libraries.总的说来，加大图书馆的投资是良策。
(3)first of all第一，首先
例：first of all，many people in remote areas still live in poverty.第一，居住在边远地区的许多人仍生活在贫困之中。
(4)with(the development/progress/growth)of(economy/society)…随着(经济、社会)的(发展、进步、增长)…
例：with the development of society，women‘s role has become more important than ever before in daily life.随着社会的发展，妇女在社会生活中比以往发挥着更加重要的作用。
(5)recently近来
例：recently，the problem(conflict，production)of grain shortage has become the world focus.近来粮食短缺问题已成为全球关注的焦点。
2.常用于文章结尾的过渡词和句子
(1)in conclusion最后，在结束时
例：in conclusion，the international agreement should be made to prevent the world from war.最后，应达成国际协定使世界避免战争。
(2)in brief简言之
例：in brief，family planning is of vital importance in china.简言之，计划生育对中国具有重要意义。
(3)in a word总之
例：in a word，without mutual understanding，true friendship does not exist.总之，没有相互理解，真正的友谊是不存在的。
(4)it is high time that…到…时候了
例：it is high time that the issue were to be solved so as to promote the economic development.为了促进经济发展到该解决问题的时候了。
(5)it is only when…that…只有当…才…
例：it is only when people become the masters of the country that science can serve the people.只有当人民成为国家的主人，科学才能为人民服务。
