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2. 主题句在文中
这类文章写法上的特点是：开始部分是引题，接着是点题，最后是对主题进行叙述，主题句常常起着承上启下的作用。如：(全国高考题)
Fat on human beings is distributed in different ways. Some fat people have a large stomach and no waistline—which makes them look round, rather like apples. Others are fatter below the waist, which makes them appear pear-shaped.
There are two types of fat: external fat (fat under the skin) and internal fat (fat inside the body wall). Doctors, who have been examining the relationship between health and fatness, have found that the 'pears' have less internal fat, but the 'apples' have more internal fat than external fat. This seems to be what causes the health problems.
The best treatment for fatness is to reduce the internal fat. But unfortunately it seems that dieting (节食) simply makes an apple-shaped person into a smaller apple and a pear-shaped person into a smaller pear. At the moment there is no known way of reducing the internal rather than external fat.
The text is mainly about ______.
A. fatness and health B. ways to lose weigh
C. people's figures D. distribution of fat
【分析】该文的第一段交代了脂肪在体内的分布状况；第二段交代了脂肪的种类及不同种类的脂肪与健康之间的关系；第三段讲的是减肥应该减掉哪一类脂肪以及节食存在的问题。很明显，第二段，特别是第二段的第二句，起着承上启下的作用，是该文的主题句。A选项符合主题句的意思，应该是正确答案；B选项与文章的意思无关；可以排除；C、D选项分别只与文章的部分信息有关，也可以排除。
