名著阅读。 我常常看到两位学者被背上的重荷压得要倒下去，像我们的小贩一样。他们在街上相遇的时候，就会放下负担，打开背包，整整谈上一个钟头。谈完话以后，才把谈话工具收起，彼此帮忙把负荷背上，然后分手道别。
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.
跨经度最多的大洲是（ ）
根据句意及所给汉语提示，完成句子，每空限填一词。
