⑵ Although most commercials only take 15-30 seconds, an astounding amount of timeand money go into their production. Marketing agencies invest a lot of money intoresearch on the most effective ways to persuade consumers to buy their products.Unfortunately, these methods typically rely on appeals to emotion rather than logic, andthus can effectively manipulate viewers into purchasing products that they really don’tneed. Media critics call for increased public awareness of advertising techniques andtheir potentially harmful effects. （10 分）