Lesson 79 By air 乘飞机 Read the passage and then answer the question.阅读短文，然后回答以下问题。Why did the plane turn back?I used to travel by air a great deal when 1 was a boy. My parents used to live in South America and I used to fly there from Europe in the holidays. A flight attendant would take charge of me and I never had an unpleasant experience. I am used to travelling by air and only on one occasion have I ever felt frightened. After taking off, we were flying low over the city and slowly gaining height, when the plane suddenly turned round and flew back to the airport. While we were waiting to land, a flight attendant told us to keep calm and to get off the plane quietly as soon as it had touched down. Everybody on board was worried and we were curious to find out what had happened. Later we learnt that there was a very important person on board. The police had been told that a bomb had been planted on the plane. After we had landed, the plane was searched thoroughly. Fortunately, nothing was found and five hours later we were able to take off again.New words and expressions 生词和短语parent n. 父（母）亲 curious adj. 急于了解，好奇的flight attendant 空中乘务员 bomb n. 炸弹frightened (1.5) /'fraitnd/ adj. 害怕，担惊 plant v. 安放Notes on the text 课文注释1 take charge of me, 照顾我。2 I am used to travelling by air, 我现在乘飞机出门旅行已经习惯了。be used to doing sth. 是“习惯于做某事”，后接名词、代词、动名词。3 only on one occasion have I ever felt frightened, 只有一次把我吓坏了。这是一句倒装句，即 have 放在主语之前。如果 only 加上一个状语放在句首，那么就要用倒装语序。4 take off, 起飞。5 gain height, （飞机）爬高。6 touch down, （飞机）着陆。7 on board, 在……（如飞机）上。参考译文...
