摘要：主题句在段首或篇首的情况相当普遍.一般新闻报道.说明文, 议论文大都采用先总述.后分述的叙事方法.例如: All living things on the earth need other living things to live. Nothing lives alone. Most animals must live in a group, and even a plant grows close together with others of the same kind. Sometimes one living thing kills another, one eats and the other is eaten. Each kind of life eats another kind of life in order to live, and together they form a food chain.Some food chains become broken up if one of the links disappears. 第一句即是主题句.这个句子概括了本段的中心意思:“地球上所有的生物要生存都离不开其他的生物 .后面讲述了大量的事实之后.作者指出:如果这些食物链中的一个链环消失.所有的食物都会断掉.所有这些事实都是围绕第一个句子展开的.

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