录音原文：
15.
W: Airports are sad places.
M: Sometimes, I guess. But we'll keep in touch and I'll fly over to see you all Christmas.

16.
M: Are you going to return to your present job after the vacation?
W: No, I plan to graduate next semester. That means I will have to be a full-time student.

解析：

15. D 女士说机场是个让人伤心的地方，男士说“保持联系，圣诞节我会乘飞机去看你。”可知他们是要分别，而不是见面，故D正确而A错误。其实他们所说的“Airports are sad places.”“ keep in touch”和“I'll fly over to see you”都是典型的告别用语。对话中没有提到机场的服务，故B不正确，选项C是用Christmas一次来进行干扰。

16. C 女士否定了return to the present job,即stop working。另外，根据关键词full-time student“做一个全日制学生”，可知她将集中精力学习，不再工作，即concentrate on her studies。所以C是最全面的概括。短对话中，正确的选项常常是原话的同义表达（或概括）。选项A是利用简单原词进行干扰，而B项“辍学”，D项“找一份兼职工作”均与对话不服。