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How has the use of helicopters developed

【参考答案】

Helicopters have been used for various purp05es.
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A．He prefers taking a plane because the bus is too slow.B．He prefers taking a bus because the plane makes him nervous.C．He prefers staying at home to traveling by plane.D．He prefers traveling with the woman.
A．He prefers taking a plane because the bus is too slow.
B．He prefers taking a bus because the plane makes him nervous.
C．He prefers staying at home to traveling by plane.
D．He prefers traveling with the woman.
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