【单选题】

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。
A．exhibit
B．extend
C．expand
D．exert