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

According to the passage, which of the following can be found in areas with quite different climatic conditions on Earth

A．Reef corals.
B．Bears.
C．Penguins.
D．Camels.

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