下列现象中，由地球自转造成的是

马航MH370失联以来，北京丽都酒店的时针变成了一把利刃，家属中悲痛、疑惑、焦躁、易怒等情绪在蔓延，多次出现情绪失控。为了对乘客家属进行有效的心理救援，某心理咨询中心拟制作一个应急手册，邀请你共同完成：

A: Hello Sandy This is Mary speaking, ____？

B. I'm Xi'an

A. Are you taking a holiday there?

B. Yes.  ____？

A: I'm writing a report.

B: ____?

A: It's about the population.

B: Well, I think you can write about the population of Xi' an.

A: Good idea. ____?

B: More than 8 million.

A: Is the population of Xi'an larger than that of Dalian?

B: ____Let me ask my father. Maybe he knows it.

A: All right.

问答题
回答唐代中外文化交流的有关问题。