[单项选择]

Passage Four
Almost every family buys at least one copy of a newspaper every day, Some people subscribe to as many as two or three different newspapers. But why do people read newspapers
Five hundred years ago, news of important happenings--battles lost and won, kings or rulers overthrown or killed--took months and even years to travel from one country to another. The news passed by word of mouth and was never accurate. Today we can read in our newspapers of important e vents that occur in faraway countries on the same day they happen.
Apart from supplying news from all over the world, newspapers give us a lot of other useful in formation. There are weather reports, radio, television and film guides, book reviews, stories, and, of course, advertisements. There are all sorts of advertisements. The bigger ones are put in by large companies to bring attention to their products. They pay the newspapers thousands of dollars for their advertising space, b
A. they cover major points of the book in detail
B. they may help reader to better understand the book
C. they can take readers a lot of time to read every part of the book
D. they may help the readers find the important parts of the book