定位段落主题句是雅思阅读答题必须掌握的一种技能，今天我们主要就出现在段首位置的第二句的主题句，为大家做详细讲解，供大家参考。接下来请看雅思内容：雅思阅读技巧绝对经典-主题句的出现位置
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? Other factors must be atwork and researchers have turned to the brain for clues. In the 1860s the French surgeon andanthropologist, Dr Paul Broca, made the remarkable finding that patients who had lost theirpowers of speech as a result of a stroke (a blood clot(凝结) in the brain) had paralysis(麻痹) of the right half of 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 in the brain’sleft hemisphere, Psychologists now believe that among right handed people, probably 95 percent have their language centre in the left hemisphere, while 5 percent have right-sidedlanguage.
第一句话提问：“如果不仅是基因让人们习惯于用左手，那还有什么原因呢?”我们能预测出，接下来这段话应该就会给我们介绍除了基因以外的其他原因。正好第二句话说：“其他的因素也起到了作用，研究者将线索转向人类大脑方面。”所以能确定，所谓的“其他原因”就是指的“人类大脑”，所以主题句也就是第二句话。
以上为雅思内容：雅思阅读技巧绝对经典-主题句的出现位置。在阅读部分，大家需要更有效合理的安排考试时间，提高做题效率。预祝大家在雅思考试中取得好成绩!