单项选择题

A．major
B．minor
C．main
D．subordinate
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单项选择题
The Commonwealth consists of______. countries which were former British colonies.
A．54
B．29
C．9
D．95
单项选择题
The practical use of radio waves brought about______.
A．new machines for planes
B．a radio directing and ranging device
C．new radio sets for RAF bombers
D．a discovering device
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