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

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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

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