A、Chinese ancient history. B、European history. C、American native civilization. D、American history. D本题测试对话的话题，要求听者根据全文进行归纳的能力。

M: I just came back from a trip to China and I was very impressed with the long history of that country.
W: Last year I visited Europe. It was interesting to see the ancient ruins there, too.
M: When I look at our country’s history, I begin to sense what a young country the States really is.
W: Yes. There are many countries whose histories were ancient when ours was just beginning.
M: The first English settlers arrived in America about the time the last Chinese dynasty began.
W: I believe one reason America has been able to be so successful in so many aspects is that it had no ancient traditions to bind it down.
M: Why would you say that? The settlers to America came from countries all over the world and must have brought their traditions with them.
W: Yes, they did and those traditions have enriched the American heritage; however, their purpose in coming to this new country was so they could make a change from the way they were living. Most immigrants to America were penniless. They came here to take advantage of a new way of life.
M: Sometimes I think we ignore the history of the native people encountered here in the Americas, both North and South.
W: Well, that’s true. I’ve noticed, however, that the remains of civilizations in North America don’t appear to be as ancient as those found in Mexico or Central and South America.
M: Those civilizations must have been as ancient as what I saw in China. They didn’t have an influence on the modern countries, though. Why is that?
W: It’s because those were dead civilizations. For some reasons, the traditions from those civilizations did not carry on to the surviving natives of the land.
M: Do you think that’s the reason, or is it that the immigrants who exerted authority over the natives were able to suppress their traditions?
W: I would think both are explanations.