题目内容：
回答题。Advertising is a form of selling. For thousands of years there have been individuals who have tried to (51) others to buy the food they have produced or the goods they have made or the services they can (52)
But in the 19th century the mass production of goods (53) the Industrial Revolution made person-to-person selling inefficient. The mass distribution of goods that (54) the development of the railway and highway made person-to-person selling too slow and expensive. At the same time, mass communication, first newspapers and magazines, then radio and television, made mass selling through (55) possible.
The objective of any advertisement is to convince people that it is in their best (56) to take the action the advertiser is recommending. The action (57) be to purchase a product, use a service, vote for a political candidate, or even to join the Army.
Advertising as a (58) developed first and most rapidly in the United States, the country that uses it to the greatest (59) . In 1980 advertising expenditure in the U. S. exceeded 55 billion dollars, or (60) 2 percent of the gross national product. Canada spent about 1. 2 percent of its gross national product (61) advertising.
(62) advertising brings the economics of mass selling to the manufacturer, it produces benefits for the consumer (63) . Some of those economies are passed along to the purchaser so that the cost of a product sold primarily through advertising is usually far (64) than one sold through personal salespeople. Advertising brings people immediate news about products that have just come on the market. Finally, advertising (65) for the programs on commercial television and radio and for about two thirds of the cost of publishing magazines and newspapers.
请在第__(51)__处填上正确答案。 A．request
B．oblige
C．affect
D．persuade
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