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定位段落主题是我们在雅思阅读中必须掌握的一项技能，尤其是在雅思考试的文章中，更是必须迅速抓准主题句，提取文章主干，缩短阅读时间，精准答题方向。
那我们应该怎么定位呢?首先，我们应该明确段落主题的大致位置，那么在哪些地方是段落主题常常出现的位置呢?
段落主题句出现得最多的位置就是段首。
英语文章中最多的就是演绎型的写法，因为西方人喜欢开门见山，所以他们常常在每一段的第一句话就先交代出这段话的主旨。这是最简单的，也是最常见的主题句位置，如下面这个例子：
As a child grows up, he learns how to behave in ways that is appropriate tothe society into which he is born. That is to say, he acquires the patterns ofbehavior that are accepted as normal in his society. This process of sociallearning is generally referred to as socialization. By socialization, then, wemean the process whereby individuals learn the rules, values and practices ofthe society in which they live.
上面这段话中的第一句就是对整体段落大意的一个介绍;从第二句话中的“That is tosay”可以看出来，第二句话是对第一句话的解释;第三句话中的“Thisprocess”也是代指的前一句话中的学习，成熟过程。而最后一句话也是对社会化的一个解释，所以也可以确定第一句话就是段落的主题句。
除了第一句之外，主题句也可能出现在段首位置的第二句。那什么时候会出现这种情况呢?分成三种情况：
(1)当首句是问句时;
(2)当首句是过渡句时;
(3)当次句为转折句时。
在这些情况下，第二句话都会比第一句话更重要，所以主题句也更可能出现在第二句话中。例如下面这句话：
What then makes people left-handed if it is not simply genetic? Otherfactors must be at work and researchers have turned to the brain for clues. Inthe 1860s the French surgeon and anthropologist, Dr Paul Broca, made theremarkable finding that patients who had lost their powers of speech as a resultof a stroke (a blood clot(凝结) in the brain) had paralysis(麻痹) of the right halfof their body. He noted that since the left hemisphere of the brain controls theright half of the body, and vice versa(反之亦然), the brain damage must have been inthe brain’s left hemisphere, Psychologists now believe that among right handedpeople, probably 95 percent have their language centre in the left hemisphere,while 5 percent have right-sided language.
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