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
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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
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 airplan
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