2. 外语
  3. A in the development of air transportation B the earliest passenger flights were successfully operated C to make travel easy and

A in the development of air transportation B the earliest passenger flights were successfully operated C to make travel easy and

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问题 A in the development of air transportation
B the earliest passenger flights were successfully operated
C to make travel easy and pleasant for the passengers
D to provide different services
E the shortage of qualified pilots
F travelling by air was very cheap
Air transport companies use different planes______.
选项
答案D
解析 第一段谈到飞机的种种用途，最后一句话讲到航空公司使用各种不同的飞机，本句便是这两方面内容的结合。
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