单项选择题

One of the reasons why VCRs are so difficult to use is that ______.

A．the desirers are often insensitive to the operational complexities of their machines
B．the range of features provided is unlimited
C．there is no ideal way of controlling quality
D．their designers often ignore the complaints of their uses

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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

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