雅思阅读中准确表达语意的标点符号

　　They play hard, they play often, and they play to win. Australian sports teams win more than their fair share of titles, demolishing rivals with seeming ease. How do they do it? A big part of the secret is an extensive and expensive network of sporting academies underpinned by science and medicine. 前两句为描述性语句，第三句问句How do they do it?后的自问自答引出了本段甚至本文的中心内容。
　　破折号
　　雅思阅读中的破折号后的内容，通常是对主句中的某个单词或短语的修饰或解释说明。破折号写法上共有两种，一种为两个破折号搭配使用，两破折号中间部分为细节即—……—，而第二种情况为—…….的情况。如剑四TEST3第二篇文章：
　　Volcanoes-earth-shattering news”中Section C第二段首句：Sometimes it is slow: vast bubbles of magma-molten rock from the mantle-inch towards the surface…… 两个破折号中的molten rock from the mantle是在解释破折号之前的名词magma.
　　破折号中的部分正好对应19题的题干：What is the name given to molten rock from the mantle? 因此答案为magma。依旧在Section C第四段中， 第四行and you can see the rough outlines of what are called tectonic plates-the plates which make up the earth’s crust and mantle.破折号后的the plates which make up the earth’s crust and mantle是在解释破折号前的tectonic plates. 此句与18题题干What are the sections of the earth’s crust, often associated with volcanic activity, called?相对应。