单项选择题

What is the passage mainly talking about

A．The reason why the Wright brothers succeeded in manned flight.
B．The role the internal combustion engine played in the Wright brothers' experiments.
C．The Wright brothers' experience as pilots.
D．The importance of gliders to the development of airplane.
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单项选择题
Why does the author suggest that the experiments with the wind tunnel were important
A．Because they allowed the Wright brothers to decrease the weight of their airplane.
B．Because they resulted in a three-axis control for their airplane.
C．Because they were important in the refinement of the wings for their airplane.
D．Because they used the data to improve the engine for their airplane.
单项选择题
In Paragraph 4, the author suggests that the steam engine used in the earlier aircrafts had failed because ______.
A．they were too small to power a large plane
B．they were too light to generate enough power
C．they. didn't have internal combustion power
D．they didn't have enough power to lift their own weight
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