该段中提到作为改进内容之一的乘客休息室已经是随处可见，行李业务也得到了改进，但是各个航空公司还是几乎无法做到加速移民入境和通关， 因此判断C 是答案。

　　5. Which of the following is a bad habit of the executive passengers that frustrates(使沮丧) the airlines?

　　A they do not book (预定)their seats in advance(提前)

　　B. they do not sit on the seats they are supposed to take(be supposed to ../应该)

　　C. they do not travel on the flight they have booked

　　D. they do not pay in advance for the seats they book.

　　答案：C.

　　分析：问题句中出现了反映细节信息的结构a bad habit of the executive passengers， 利用这个结构作为答案线索，这样找到答案相关句：

　　(最后一段)Although it is the airlines intention to attract executive passengers from their rivals, the airlines themselves would nonetheless(虽然如此) like to change one bad habit of this kind of traveler the expensive(代价很高的) habit of booking(预定) a flight(航班) and then failing to(没有) turn up.

　　该段中的答案相关据明确地说明了乘客的坏习惯：预定了航班却不乘坐。 所以C(他们不乘坐已经预定好的航班)是答案。

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