单选题 The business of advertising is to invent methods of addressing massive audiences in a language designed to be easily accessible and immediately persuasive. No advertising agency wants to (51) out an ad that is not clear and convincing to millions of people. But the agency, (52) they would agree that ads should be written to sell products, disagree when it (53) down to the most effective methods of doing so. (54) the years, advertising firms have developed among themselves a variety of distinctive styles (55) on their understanding of the different kinds of audiences they want to reach. No two agencies would handle the (56) product identically. To people (57) whom advertising is an exacting discipline and a highly competitive profession, an ad is (58) more than a sophisticated sales pitch, an attractive verbal (59) device to serve manufactures. In fact, for those who examine ads critically or professionally, products may very well be (60) more than merely points of departure. Ads often (61) their products, and in the (62) of early advertisements for products that are no longer available, we cannot help (63) consider the advertisement independently of oar responses to those products. The point of examining ads apart (64) their announced subjects is not that we ignore the product completely, but (65) we try to see the product only (66) it is talked about and portrayed in the full (67) of the ad. Certainly, it is not necessary to (68) tried a particular product to be (69) to appreciate the technique section and design used in (70) advertisement.