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补全短文

Most paragraphs in an article have a topic sentence that expresses the central idea. The opening paragraph often suggests the general direction and content of the article， while paragraphs that follow expand or support the first. The closing paragraph often gives a summary of the most important points of the article.

The main idea of this paragraph is __________.

A.The Organization of an Article

B.To understand the paragraph

C.A Way to Increase Your Reading Speed

D.Check Your Understanding

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