单项选择题

As mentioned in the last paragraph，a wind tunnel can be used to find out____.

A．how fast a plane can rise
B．how smooth a plane’s surface is
C．how a plane lands in a strong wind
D．how a plane drops at a low height
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单项选择题
The underlined words“this fact”in Paragraph 3 refer to the fact that____．
A．it costs a lot to test a plane
B．the wings are not good enough
C．some problems are found with a plane
D．the wings meet the high-speed air flow in the tunnel
单项选择题
Which of the following would be the best title for the passage
A．Protect Yourself
B．Try to Speak Out
C．Share Your Opinion
D．Face Your Superior
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