单项选择题

Which of the following is NOT mentioned as a reason for the Wright brother's success

A．They worked very well together.
B．They both had practical experience building aircraft.
C．They made extensive tests before they completed the design.
D．They were well funded.

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单项选择题

The word "incessantly" in the first paragraph could best be replaced by ______.

A．confidently
B．constantly
C．intelligently
D．optimistically

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

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.

单项选择题

Which of the following is NOT mentioned as a reason for the Wright brother's success

A．They worked very well together.
B．They both had practical experience building aircraft.
C．They made extensive tests before they completed the design.
D．They were well funded.

单项选择题

In the fourth paragraph, the author suggests that the steam' engine used in the earlier aircrafts had failed because they ______.

A．were too small to power a large plane
B．were too light to generate enough power
C．didn't have internal combustion power
D．didn't have enough power to lift their own weight