单选题：Nowadays airports provide all kinds of services

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题目类型：单选题
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题目内容：

Nowadays airports provide all kinds of services 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

参考答案：

答案解析：

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分类：综合类题型：单选题

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分类：综合类题型：单选题