单项选择题

If you want to ring back, you have to______

A．redial the telephone
B．know the free telephone number to a computerized switch in another country
C．find another person to call you back
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单项选择题
The Price of international calls into America is______
A．higher than that of the calls out of America
B．far lower than that of the calls out of America
C．is the same as that of the calls out of America as it is decided by the cartel
单项选择题
24（）

A．shown
B．done
C．drawn
D．known
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