单项选择题

According to the passage before a VCR is sold on the market, its original model should be tried out______.

A．among ordinary consumers who are not technically minded
B．among people who are technically minded
C．among experienced technicians and potential users
D．among people who are in charge of public relations

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热门试题

单项选择题

It seems that manufacturers will remain reluctant to make improvements unless ______.

A．they can do so at a very Iow cost
B．they find their machines hard to operate
C．they have difficulty selling their products
D．they receive a lot of complaints about their machines

单项选择题

According to the author, manufacturers______.

A．should add more useful features to their machines
B．often fail to make their products easy to use
C．should make their appliances as attractive as possible
D．often fail provide proper training in the use of their products