Air transport companies use different planes__________.

单选材料题

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 traveling by air was very cheap

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正确答案：

本题解析：

【答案】A
【解析】根据第一段可知，航空公司利用飞机运输旅客，货物和邮政。运营的飞机从单引擎到大型多引擎飞机。A为“在不同运输发展阶段使用不同飞机”符合逻辑和题意。因此，本题选A。