单项选择题

Computers in the United States （）

A．used to be too small to use
B．used to be nice
C．used to be heavy
D．used to be large and expensive

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单项选择题

Computers have been getting more popular（）

A．because the Americans want to appear rich
B．because they are smaller, cheaper and easier to use
C．because they can help Americans do everything
D．because 'they can type letters

单项选择题

（） have been playing computer games.

A．Children
B．Young people
C．Old people
D．People of all ages