单项选择题

Police in Colombia arrested four men accused of______.

A．hiding evidence of an air crash
B．stealing passengers' belongings
C．theft and attempted extortion
D．selling stolen aircraft flight records
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单项选择题
The British used radio waves because they______.
A．were more exact than sound waves
B．could not be discovered
C．could pass through fog and clouds
D．were easier to use than sound waves
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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