【正确答案】 D

【答案解析】[解析] 6-7
W: (7) We are now in Washington D.C., the capital city of America.
M: It must be the political centre of America.
W: That's for sure. (7) People it Washington D.C. since it lies in the district of Columbia. You know there is also a state named Washington in America. But it is in the Northwest of our country.
M: I think this city's name must be connected with President Washington.
W: Yes. George Washington has been highly respected by the American people. (6) To show their admiration and love for President Washington, they name their capital city Washington D.C.
M: Oh, I see.
W: (7) Look, there is the Washington Monument: It is the highest needle shaped building in the world. The height is 55 feet.
M: Will we visit the Library of Congress?
W: Yes. The Library of Congress is the largest library in the world. The glass ceiling makes the library very bright.
M: Your interpretation is so helpful.
6. Q: Why did people name this city Washington D.C. ?

[解析] 根据原文(6)处可知，人们为了表示对华盛顿的钦佩和爱戴而把首府命名为washington D.C.，故选 D。

【正确答案】 A

【答案解析】[解析]
Q: What's the relationship between the two persons?

[解析] 根据原文(7)处及全文可知，这位女士一直在给这位男士介绍华盛顿这一城市，包括其地理位置、名称的由来以及它的两个著名景观，包括华盛顿纪念碑和国会图书馆，因此可以判断女士是导游，而男士是游客，故选A。