单项选择题

How many examples were given by the writer to show the use of radio on the great farms

A．Three.
B．Only one.
C．Two
D．Four
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单项选择题
In fact, the Englishman who tried to fly ______.
A．lost his life
B．flew only 8 minutes
C．got badly wounded
D．succeeded in flying
单项选择题
Eight hundred years ago an Englishman ______.
A．made a kind of flying machine
B．tried to fly with wings made of chicken feather
C．wanted to build a kind of balloon
D．tried to fly on a large bird
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