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A．The amount of sleep people need in different age groups.
B．Sleeping problems of old people.
C．The relationship between sleep and health.
D．The importance and necessity of sleep.
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单项选择题A．The influence of computers on our daily lives.B．The disadvantages of computers.C．People s different attitudes towards computers.D．The popularization of computers.

A．The influence of computers on our daily lives.
B．The disadvantages of computers.
C．People"s different attitudes towards computers.
D．The popularization of computers.

单项选择题A．It isn t the most popular tourist sight any longer.B．It is the second oldest tower in London.C．It is visited by more than 3,000,000 visitors every year.D．It was first built by James I.

A．It isn"t the most popular tourist sight any longer.
B．It is the second oldest tower in London.
C．It is visited by more than 3,000,000 visitors every year.
D．It was first built by James I.