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A paragraph is a group of related sentences developing one central idea, or expressing one unit of thought. The typical paragraph is a discourse unit smaller than the complete essay but longer than the sentence, though graphs and one-paragraph essays. This middle position makes the paragraph extremely important in essay writing. For one thing, it is possible to write a good essay only when we can write well-structured and well-connected paragraphs. In fact, the paragraph may be regarded as mini-essay it shares many features with the complete essay. For another, producing a well-formed paragraph involves more than the ability to write correct and good sentences. Therefore, for the beginning writers who have learnt the Basic English grammar and have acquired a workable vocabulary, the training in paragraph writing is the crucial first step towards writing well in English. （小四，1.5倍行距）

（标题不缩进；正文首行缩进两个字符）

注意页眉、页脚

2. The topic sentence

We have known the importance of paragraph writing, but how can we write a paragraph? First of all, we need to decide on our purpose; we need to decide in advance what idea we are trying to communicate in our paragraph; we need have a topic sentence, in most cases, to make our idea clear.

The topic sentence expresses our paragraph’s central idea or purpose, it indicates what the paragraph is about, or what it will describe or discuss. A good topic sentence serves as a guide, reminding the writer of the paragraph’s boundaries and, therefore, helping to assure a well-unified paragraph.

But what should an effective topic sentence be like? The following are some of topic sentences expressed in the form of a sacrament:

①Women are playing an increasingly important part in society today.

②Television presents a vivid world in front of us.

③Writing an outline is an aid to organizing a composition.

④Exercise is important to the health.

⑤Spring is the most pleasant season of the year.

⑥Education is a glorious cause.

The above topic sentences are successful because they not only introduce limited topic but also give the writer’s opinion about each topic.

Here are two more topic sentences:

⑦Going to college is expensive.

⑧Northwestern is a university in Illinois.

Of the two topic sentences, ⑦is too general and ⑧is a factual one, so they allow no development. From above we know an effective topic sentence has three characteristics: it includes a subject and a controlling idea; it is limited; and it lends itself to development.

Topic sentence usually appears at the beginning, but may also be found in the middle or at the end, of a paragraph.

We can also see how every philosopher reflects the social life at his day. Plato and Aristotle, in the slave-owning society of ancient Greece, Thought man’s highest state was contemplation rather than activity. In the Middle Ages St. Thomas believed in a regular feudal system of nine ranks of angels. Herbert Spencer, in the time of free competition between capitalist, found the key to progress in the survival of the fittest. Thus Marxism is seen to fit into its place as the philosophy for the workers, the only class with a future.

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