单选题：As mentioned in the last paragraph，a wind tunnel can be used

题目分类：英语
题目类型：单选题
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题目内容：

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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