单项选择题

From the passage, you can tell that people prefer glass fiber cables to copper cables because （）

A．glass fiber is less expensive
B．glass fiber delivers messages directly
C．glass fiber is more up to date
D．glass fiber is easier to make

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单项选择题

According to the passage the new telephone communication system （）

A．has been put into actual use
B．was first put into actual use in 1977
C．had been repeatedly experimented on before 1977
D．was put on experiment in 1977

单项选择题

54（）

A．enormous
B．human
C．undesirable
D．generous