单项选择题

The author had trouble operating his VCR became ______.

A．he had neglected the importance of using the timer
B．the machine had far more technical features than necessary
C．he had set about using it without proper training
D．its operation was far more difficult than the designer intended it to be

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热门试题

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

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