题目内容
（请给出正确答案）
What can we learn from the passage？
A．It is very expensive to build a wind tunnel.
B．Wind tunnels are very essential in testing planes.
C．Scientists still have a lot to learn about wind tunnels.
D．There are new ways to feed air to the test section.
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A.so that
B.so
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A．Reading is just a way of knowing new words
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B．invited Emma to a concert
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A．pessimistically
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C．optimistically
D．distrustfully
From the passage we can learn that ______.
A．Amy has never recovered from the shock
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