Lesson 79 By air乘飞机First listen and then answer the question.听录音，然后回答以下问题。Why did the plane turn back?I used to travel
新概念英语第二册第79课:By air。。。Lesson 79 By air乘飞机First listen and then answer the question.听录音，然后回答以下问题。Why did the plane turn back?I used to travel
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