【单选题】

We got up early this morning and (61) a long walk after breakfast. We walked through the business (62) of the city. The city (63) larger than I thought it would be. Well, the business section is smaller than I thought it would be. I suppose that’s (64) Washington is a special kind of city. (65) of the people in Washington work for the government.

About 9:30 we went to the White House. It’s (66) the public from 10 (67) 12, and there was a long line of people (68) to get in. We didn’t have to wait very long, because the line moved (69) quickly.
The White House is really white. It is painted every year.And it seems very white, be cause it’s got beautiful lawns (70) around it, with many trees and shrubs. The grounds (71) about four square blocks. I mean, they’re about two blocks long (72) each side.
Of course, we didn’t see the whole building. The part (73) the President lives and works is not open to the publiC、But the part we saw was beautiful. We went (74) five of the main rooms. One of them was the library on the ground floor. On the next floor, there are three rooms named (75) the colors that are used in them: the Red Room, theBlue Room, and the Green Room. The walls are covered with silk (76) . There are (77) of old furniture from the time (78) the White House was (79) built.And everywhere there are paintings and statues of former presidents and (80) famous people from history.
A、reasonB、forC、since D、because