大学英语综合教程3Unit 8答案

答案3Unit-8大学英语综合教程Unit 8

Pre-Reading Task Part I

Script for the recording:

A Clone of Our Own

it's go before long way to still be the next clones? The technology has a Will humans

considered safe to try on humans. But even if it were safe, would it be right? Let's hear what

Professor Hank Greely of Stanford University has to say on this topic . Interviewer: When will we clone a human?

Greely: That's not a simple question. I think we have to ask ourselves: is there something

about the technology that is so wrong or so evil that it shouldn't be used at all? Or should it be

judged according to its intended uses? Interviewer: What are acceptable uses?

Greely: We really need to distinguish between different types of cloning. If we use cloning to

grow a new liver, I don't think many people will have problems with that

- as long as it's

growing a liver and not taking a liver from a cloned person. Human reproductive cloning is

much trickier. Interviewer: Why?

Greely: Safety. There's still a very low success rate. With Dolly, the first cloned lamb, 29

treated eggs were implanted in sheep to get one Dolly. We don't worry too much about sheep

miscarriages or about deformed lambs being born. But we would with humans. And we

wouldn't know if a human clone would be healthy. Interviewer: Dolly appears to be healthy.

Why wouldn't a human clone be so?

Greely: There may be cell changes that are initially invisible and only show themselves as

the clone ages. There's also a problem with the ends of chromosomes in cells,

which shorten until the cells can no longer reproduce. We know that Dolly's chromosomes are shorter than those of other sheep her age, and we don't know

what that means yet.

I

- 188 -Appendix

Interviewer: Suppose human cloning was safe. In what situations do you see cloning being used?Helping parents who are having difficulty having children would be one area. Greely:

Interviewer: Are there other situations where it might be acceptable to create a human clone?for an marrow donor to be a bone situation where parents want to create a new child A Greely:

older sick child. That's a real tough one. But that issue might never arise if we succeed in growing

I accidentally died. child who has the body. Another situation is cloning a bone marrow outside

think that's disturbing. But I've never been in that position and so I don't feel comfortable saying

Interviewer: What about whether that's a good application or a bad application of the technology.

cloning a Hitler or Michael Jordan ?Interviewer: Is there I think we can dismiss those as bad or even silly applications. Greely:

anything else you'd like to say about the future of human cloning?and

right it was as a society had decided were Greely: Even if cloning humans safe and we

The of clones. we'd see a lot purposes, proper for reproductive I don't think oldfash-ioned way of making babies has a lot going for it: It's easy, traditional, well

sex up going to give pleasant. and occasionally even People are not understood, anytime soon.

Part II Text A

Texf Organization

1PartParagraphMain Idea

Dolly the sheep, a clone, was bornParas 1-Part On

Paras 3-Part TwDolly's birth has made cloning a reality and human cloning a possibility