高二年级高中英语听力mp3下载人教版(2)

Unit 2

HOW AN UNBALANCED DIET CAN AFFECT YOUR HEALTH

Wang Peng went to the library, where he happened to meet an expert on diets. He asked him for help.

WP=Wang Peng E=Expert

WP:

E: Hello. Can you help me, please? I want to find out more about balanced diets. Of course. A balanced diet needs energy food like rice and noodles, body-building food like fish and meat for protein and fat, and protective food like fruit and vegetables for fibre and vitamins.

Yes, but does it matter how much rice, noodles and sugar I eat?

Yes. If you eat too much, you may become obese. This means you are too fat and it may lead to other illnesses. However, if you don’t eat enough rice, noodles or sugar, you’ll get tired easily.

I see. I’ll be careful about that. Does it matter how much fish, meat or cheese I eat?

Too much can also make you fat, but if you don’t eat enough, your bones won’t grow strong. A long time ago, children who didn’t eat enough vitamin D and body-building food didn’t grow straight legs. They got an illness called rickets.

Oh dear! Do people still have the problem?

Sometimes.

Then what about fruit and vegetables? How much should I eat?

You ought to eat about five big spoonfuls of different fruit and vegetables every day.

Really? I didn’t know that.

Yes. In the 18th century sailors at sea used to find that their teeth fell out and they had bad spots on their skin. They got it because they didn’t eat enough fruit and vegetables. The illness is called scurvy.

Goodness! What about now?

It’s very rare now. People eat more fruit and vegetables. You need protective food like that for clear skin and bright eyes.

Thank you very much. You have given me a lot to think about.

Unit 4

THEORIES OF GRAVITY

Michael Jones of the New Space Magazine is talking with space traveller Li Yanping about changes in the theory of gravity. WP: E: WP: E: WP: E: WP: E: WP: E: WP: E: WP:

LY=Dr Li Yanping MJ=Michael Jones

Part 1

MJ: Hello, Dr Li Yanping. It’s so good of you to talk to me. Some students ask us why things always fall back to earth if you throw them up in the air. Could you explain it?

LY: Well, at first people thought it was because the earth was the centre of the universe. Of course that was wrong. One day Isaac Newton watched an apple fall to the ground. He said that something else must be pulling the apple back to earth. He called it “gravity”.

MJ: I see. Did people accept his idea?

LY: They did. Later they worked out that bigger objects (like the sun) have stronger gravity than smaller objects (like our planets). If you’re travelling in deep space, you couldn’t fall back to the earth. You’re just too far away. Part 2

LY: Does it mean there’s no gravity in space?

MJ: No. in a spaceship you would feel the pull as it got closer to such an object. You would travel faster and faster towards it.

LY: Until you hit it?

MJ: Not exactly. You may pass it very fast and then it would throw you out into

space again. After that you would slow down to the usual speed.

LY: How do you know this?

MJ: In 1905 Einstein said that in space large objects make space-time bend; the larger the object, the further space-time bends. So time goes slower in very strong gravity.

LY: What about black holes?

MJ: That’s a place in which has such a strong mass that nothing can escape from its gravity. There is a kind of edge around this mass. If you cross over this edge, it’s impossible for you to get back. However if you don’t cross this edge, you can still escape. Stephen Hawking has done a lot of research into back holes. He has shown that they “spit” things out as well as “eat” them.

Unit 5

WHAT IS A CANADIAN?

I am a Canadian and very proud of my country. However, people sometiomes don’t know what being Canadian really means. People who come to Canada are encouraged to be proud of their own culture and keep their own customs. Except for the Native Indians, everybody else who lives here came from another country or

their ancestors did. Canada is a micture of many cultures and races. It is what we call a multicultural country.

We have two official languages, Frech and English. Even though we encourage people to keep their own customs, we expect everyone to learn French or English in order to live in Canada. If you live in the province of Quebec, you are expected to speak French. However, the Native Indians and the Inuit of Canada are still trying to keep their languages alive. You can hear some of their languages in the names of rivers and lakes as well as cities. “Canada” means “village”. Toronto and Ottawa are also Native Indian names. There are radio and television programmes,newspapers and magazines in over 80 different languages across Canada, and the Toronto city government offers help to people in 70 languages.

Many of our big cities have areas where people from the same culture live near each other – there might be a Chinatown, a Little Italy, a Korea Town and so on. However, people whose families have lived in Canada for a long time are usually all mixed up. My own family is a mixture of English, Native Indian and French. My neighbour’s family is Chinese, German and African!

When I say that I am proud to be a Canadian, maybe you can help me decide what a Canadian is.