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
The forty years from the 1930s to the 1970s was an important period ______
选项
答案A
解析 这句话概括了第三段的主要内容。
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