单项选择题

（） have been playing computer games.

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

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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

It may be concluded that （）

A．computers have been widely used by Americans
B．computers can solve complex problems
C．computers are domestic robots
D．computers are new machines