4. The plane went off its_________ to keep away from the sudden storm.

A.road                                     B.course?

C.fly                                      D.direction

B


解析:

飛機脫離了“航線”，用course。?

答案：B

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--- Do you know the reason _________ pilots turn off the plane’s lights before taking off?

   ---The practice is for the passengers to adjust to the dark _________ an emergency.

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C. how; for fear of                      D. that; in case

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