单项选择题

In the author's point of view, money is ______.

A．love
B．power
C．security
D．a substitute for something a person's life lacks
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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
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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