题目内容
A．40 students attended the class.B．There were 33 students in the class.C．18 boys shoul
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A．firstlyB．at firstC．firstD．early
About 9:30 we went to the White House. It's【61】the public from ten【62】twelve, and there was a long line of people【63】to get in. We didn't have to wait very long, because the line moved pretty quickly.
The White House is really white. It【64】every year. And it seems very white, because it's got beautiful lawns【65】around it, with many trees and shrubs. The grounds【66】about four square blocks. I mean, they' re about two blocks long【67】each side.
Of course, we didn't see the whole building. The part【68】the president lives and works can not be visited by the public. But the part we saw was beautiful. We went through five of the main rooms. One of【69】was the library, on the ground floor. On the next floor, there are three rooms named【70】the colors that are used in them: the Red Room, the Blue Room, and the Green Room. The walls are covered with silk【71】There are【72】old furniture, from the time【73】the White House was【74】built. And everywhere there are paintings and statues of former presidents and【75】famous people from history.
(56)
Paragraph Two implies that in treating infertility, ______.
According to the writer, the main problem with the development of human cloning technology
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