单选题
英语
2009-12-22
What can we learn from the passage?
A.It is very expensive to build a wind tunne
B.Wind tunnels are very essential in testing plane
C.Scientists still have a lot to learn about wind tunnel
D.There are new ways to feed air to the test sectio
参考答案
B
答案解析
文章最后一段说明wind tunnels 在检测新飞机的性能上是非常重要的。故B正确。