新視野大學(xué)英語視聽說教程第四冊 Unit 8 Task 1: Stem Cell Research
Gregory: The Republican party in America is opposing stem cell research. I find it
hard to believe that in this day and age, someone would do that.
Lillian: Stem cell research sounds pretty impressive, I’ll admit. But just what is it?
Gregory: Well, a stem cell is a special type of cell. It is a general cell that, when it
devides, can become any specific type of cell.
Lillian: You mean, a stem cell can become a heart cell? Or a brain or a kidney cell?
Gregory: That’s about it. Stem cells are a part of the body’s maintenance and repair
system. When they divide, they can become any cell type.
Lillian: I guess there would be some tremendous medical advantages in that sort of
research.
Gregory: You’ve said a mouthful. Recently, scientists were able to help a man who
lost a jawbone for cancer. They recreated bone material for his jaw from stem cells. What it means is that since the new bone was created out of the person’s own cells, there was no problem with rejection because the DNA was the same.
Lillian: I bet the person was delighted. Why would anyone oppose that sort of research? It would seem to have endless potential to benefit the human race.
Gregory: I agree, but there are people who think we should not interfere with nature and manipulate “what is natural”.
Lillian: It’s easier to hold such a narrow view if you’re not in a position to need the benefits of the research. If you’re missing a jawbone because of cancer, you probably support the research.
1. What is the passage mainly about?
2. Who is against stem cell research?
3. What is special about a stem cell?
4. When can a stem cell become another cell type?
5. According to the passage, why do some people oppose stem cell research?
Keys: 1.B 2.A 3.A 4.A 5.D
