单项选择题


A．but
B．however
C．so
D．because
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单项选择题
A．norB．butC．orD．so
A．nor
B．but
C．or
D．so
单项选择题
What is said about the development of the helicopters from the passage
A．People came up with the conceptual idea of a helicopter in this century.
B．Helicopters were thought to be much more dangerous than the early airplanes.
C．Chinese children were the first to experience flights in helicopters.
D．Some people thought that helicopters would develop into popular use one day.
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