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A．firstlyB．at firstC．firstD．early
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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
Human cloning (克隆) technology could be used to reverse heart attacks. Scientists believe that they may be able to treat heart attack victims by cloning their healthy heart cells and injecting them into the areas of the heart that have been damaged, and other problems may be solved if human cloning and its technology are not forbidden.
With cloning, infertile couples could have children. Current treatments for infertility, in terms of percentages (百分比) , are not very successful. Couples go through physically and emotionally painful procedures for a small chance of having children. Many couples run out of time and money without successfully having children. Human cloning could make it possible for many more infertile couples to have children than ever before. We should be able to clone the bone marrow (骨髓) for children and adults suffering from leukemia (白血病). It is expected to be one of the first benefits to come from cloning technology.
We may learn how to switch cells on and off through cloning and thus be able to cure cancer. Cloning technology can be used to test for and perhaps cure gene-related diseases. The above are just a few examples of what human cloning technology can do for mankind.
This new technology promises unprecedented advancement in medicine if people will release their fears and let the benefits begin.
Heart attacks can be treated with human cloning technology by______.
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