Millions of dollars often depend on the choice of which commercial to use in launching a new product. So you show the commercials to a (1)_____ of typical consumers and ask their opinion. The answers you get can sometimes lead you into a big (2)_____. Respondents may lie just to be polite. Now some companies and major advertising (3)_____ have been hiring voice detectives who test your normal voice and then record you on tape (4)_____ commenting on a product. A computer analyzes the degree and direction of change (5)_____ normal. One kind of divergence of pitch means the subject (6)_____ Another kind means he was really enthusiastic. In a testing of two commercials (7)_____ children, they were. vocally, about equally (8)_____ of both. but the computer reported their emotional (9)_____ in the two was totally different. Most major commercials are sent for testing to theaters (10)_____ with various electronic measuring devices. People regarded as (11)_____ are brought in off the street. Viewers can push buttons to (12)_____ whether they are interested or bored. Newspaper and magazine groups became intensely interested in testing their ads for a product (13)_____ TV ads for the same product. They were interested because the main (14)_____ of evidence shows that people (15)_____ a lot more mental activity when they read (16)_____ when they sit in front of the TV set. TV began to be (17)_____ "a low-involvement" (18)_____. It is contended that low involvement means that there is less (19)_____ that the ad message will be (20)_____.Notes: commercial 广告。pitch 音调。