申傅138娱乐_太阳城赌城申博

太阳集团娱乐网址坛论

英语听力 学英语,练听力,上听力课堂! 注册 登录
> 在线听力 > 英语高级听力 > 一起听英语 >  第180课

一起听英语 180 病毒

所属教程:一起听英语

浏览:

xijijun

2018年07月31日

随身学
扫描二维码方便学习和分享
http://online2.tingclass.net/lesson/shi0529/10000/10061/180.mp3
http://image.tingclass.net/statics/js/2012
病毒存在了多少年,我们人体内有多少基因?这些科学问题来让我们揭晓。

William: Hello and welcome to 6 minute English. I hope you're ready for another five

minutes and fifty-five seconds of wonderful English language conversation

about an interesting topic from BBC News. I'm William Kremer.

Helen: Hello, I'm Helen Hu. Today we're talking about genes...

William: Oh right! Is that why we're both wearing jeans?

Helen: No, no, not that kind of jeans. Genes spelled G-E-N-E-S – these are the

molecules in our body which hold genetic information. So genes tell our

bodies how they should grow and develop.

William: Right, and genes are what parents hand down to their children. We carry

genes from one generation to the next.

Helen: Now before we go any further, it's time for our weekly quiz. Were you very

good at science at school, William?

William: Not particularly.

Helen: Good! You'll be rubbish at this then. OK, the question is: How many genes do

human beings have? Is it

a) between 10,000 and 25,000 or is it

b) between 100,000 and 250,000 or

c) between 1 million and 2.5 million

William: OK, well I have no idea so I'm going to go for c) between 1 million and 2.5

million.

Helen: OK, well the answer will be at the end of the programme. Now, a new

scientific study has looked at the genes of lots of animals and found traces of

the same viruses that existed a long time ago.

William: Right, they found traces – signs that something happened or existed. And the

traces they found were of viruses, the tiny creatures that spread infectious

diseases. So Helen, they think that these viruses have existed for millions of

years then...?

6 Minute English © British Broadcasting Corporation 2012

Page 2 of 4

bbclearningenglish.com

Helen: Exactly. Let's listen to a clip from BBC correspondent David Shukman. See if

you can hear which animals the researchers studied:

BBC correspondent David Shukman:

Researchers from Oxford, New York and Belgium have investigated the genes of 38

mammals – including humans, mice, elephants and dolphins, and they've found that most of

them share traces of the same ancient viruses. The work has established that at least one

virus infected our common ancestors as long as one hundred million years ago.

Helen: So, did you hear which animals were mentioned?

William: The researchers investigated 38 different mammals including humans, mice,

elephants and dolphins.

Helen: That's right. And by comparing the genes of the animals they've concluded

that there was at least one virus that infected our ancestors perhaps a

hundred million years ago.

William: Wow. An ancestor is a person or plant that is related to something today but

that lived earlier. So... so what? So what, Helen? What's the significance of

that?

Helen: Well, for a start it suggests that these viruses are incredibly good at survival.

And as we will hear in our next clip, these diseases have not only survived,

but they also have evolved – they have changed and adapted slowly over a

long time.

William: OK, so let's hear the next clip now. See if you can hear the word that David

Shukman uses instead of the word viruses.

BBC correspondent David Shukman:

The scientists found that these micro-organisms have adapted to stay within their host cell,

where they have thrived. So within the double helix of our DNA lies not only a legacy of past

infections but also a miniature eco-system in which the viruses live on and evolve.

William: David Shukman used the word micro-organisms instead of the word viruses. A

micro-organism is a very very small creature.

Helen: He said the scientists found that the micro-organisms had thrived, meaning

they had prospered, they had developed well. The research suggests that our

genes actually help viruses to survive and evolve. And some viruses have

developed positive outcomes. For example the protein syncytin evolved from

a virus and has helped develop the female placenta.

William: OK, so these micro-organisms can be good things?

Helen: Well, they are not exactly 'good', but they have helped us to evolve.

William: Ah sorry, I wasn't being very 'scientific'! Let's hear the final clip now, and

we're going to hear the opinion of the senior researcher on the project. See if

you can hear why he thinks his research could be useful in the future.

6 Minute English © British Broadcasting Corporation 2012

Page 3 of 4

bbclearningenglish.com

BBC correspondent David Shukman:

According to the senior author of the study, Dr Robert Belshaw of Oxford University,

understanding these survivors from the distant past may provide clues to the early detection

of cancers or infections.

William: Robert Belshaw thinks understanding the viruses might help the early

detection of cancers or infections – they might help us notice these diseases

early on.

Helen: OK, time to hear the answer to our quiz. I asked you how many genes human

beings have and you choose c) between 1 million and 2.5 million. Well, the

answer is a) 10,000 – 25,000.

William: Huh.

Helen: Ok, I can tell you're not that interested in this so why don't you do something

useful and remind us of today's vocabulary?

William: Okey-doke.

genes

a trace

a virus

an ancestor

to evolve

a micro-organism

to thrive

detection

Helen: If you would like to know more about these words, download our pdf script on

bbclearningenglish.com.

William: Goodbye!

Helen: Bye!

内容来自 听力课堂网:/show-10061-420073-1.html
用手机学英语,请加听力课堂微信公众号:tingclass123
用户搜索

疯狂英语 英语语法 新概念英语 走遍美国 四级听力 英语音标 英语入门 发音 美语 四级 新东方 七年级 赖世雄 zero是什么意思