单项选择题

Passage Four 
Questions 16 to 20 are based on the following passage. 
Newspapers, along with reporting the news, educate, entertain, and give opinions. An important way for reading a large, big-city newspaper is knowing how to take it apart. Can you find these separate sections: world news, national and local news, sports, business, entertainment, opinions, classified advertisements? Does your paper have other sections? 
    News stories give facts, not the author's opinions. Editorials (社论) do the opposite, you can expect an editorial to take sides. Some newspaper editorials have a by-line with the author's name, but many newspapers have unsigned (未署名的) editorials. These reflect the opinions of the publisher or editor. 
 
    You can be a better reader if you know what to expect in a newspaper. For example, you can expect headlines to omit unnecessary words. You can expect to find the most important facts in the first paragraph of a news story. You can expect important news items to be on the front page. You can expect less important items to be on the inside pages. 
    Most of all, the more you know about the current news, the more you will understand what is in the newspaper; important stories are generally presented one day and followed up on following days. So, an important way for reading newspapers is reading one frequently.

 When reading a large newspaper, one should （）  . 

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