单项选择题

What is the most expensive type of call

A．Direct dial.
B．Through the operator.
C．Reverse charge call.
D．Outside office hours.
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单项选择题
From the news in Miami we know ______.
A．the mayor has agreed with the teachers' union
B．the teachers' strike will last long
C．students haven't been to school for two weeks
D．the mayor was trying to end the schools
单项选择题
A group of top Chinese scientists will ______.
A．visit the U. S. and Western Europe to improve the ties between China and them
B．come closer to the U. S. and Western Europe
C．close the door of China to the U. S. and Western Europe
D．improve the ties between the U. S. and Western Europe
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