The attention-getting property of commercials can be seen by observing one-to two-year-old children who happen to be playing around a television set. They may totally ignore the programming. However, when a commercial comes on, their attention is immediately drawn to it because of its dramatic sound quality.

　　31.According to the passage, the maximum intensity of sound coming from commercials _______.

　　A) does not exceed that of programs.

　　B) is greater than that of programs.

　　C) varies over a large range than that of programs.

　　D) is less than that of programs.

　　注：文章第一段no difference

　　32.Commercials create the sensation of loudness because _______ .

　　A) TV stations always operate at the highest sound levels.

　　B) their sound levels are kept around peak levels.

　　C) their sound levels are kept in the middle frequency ranges.

　　D) unlike regular programs their intensity of sound varies over a wide range.

　　注：第二点

　　33.Many commercials begin with a cheerful song of some kind because ________ .

　　A) pop songs attract viewer attention.

　　B) it can increase their loudness.

　　C) advertisers want to make them sound different from regular programs.

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