单项选择题

Questions 17-20 are based on a radio programme.
When did Davis begin this programme

A．1917.
B．1950.
C．1965.
D．1973.
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单项选择题
How often is the bus scheduled to pass the stop
A．Every ten minutes.
B．Every twenty minutes.
C．Every half an hour.
D．Once a day.
单项选择题
Where would you find a book on electronic engineering
A．Level 1.
B．Level 2.
C．Level 3.
D．Level 4.
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