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听力原文:Can you imagine ice that does not melt and is not wet? Have your ever heard of dr

听力原文: Can you imagine ice that does not melt and is not wet? Have your ever heard of dry ice? Dry ice is made by freezing a gas. It is quite different from ordinary ice which is simply frozen water. Dry ice was first manufactured in 1925. It has since fulfilled the hope of its invent or. It can be used for making artificial fog in the movies. When steam is passed over dry ice, a very dense vapor rises. It can also be used for destroying insects in grain supplies. It is more practical than ordinary ice because it takes up less space and it is 142 degrees colder. Since it turns into steam, instead of melting into water, it is cleaner to use. For these reasons, it is extremely popular and many people prefer it to ordinary ice. Dry ice is so cold that if you touch it with your bare fingers, it will burn you.

(33)

A.Chemicals.

B.Vapor.

C.Water.

D.Gas.

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更多“听力原文:Can you imagine ice that does not melt and is not wet? Have your ever heard of dr”相关的问题

第1题

听力原文:If you are someone who tends to focus on the negative, thinking positively may be

听力原文: If you are someone who tends to focus on the negative, thinking positively may be a new skill for you. One way to keep a positive attitude about yourself is by writing down and saying several sentences. The sentences should be strong ,supportive statements about yourself such as "I am a confident and capable person who can handle challenges. "It's hard to feel defeated when your self-talk is positive. Another technique for reducing stress is positive images. When confronted with a problem, try to imagine the outcome that you want. This technique is used by sport professionals with tremendous success. You too can champion your cause by mentally picturing positive results. Sometimes people are faced with unfortunate circumstances that can not be changed. In these instances, it may help to think about some of the assets and resources that you have that can support you and help you cope such as family, friends, skills, education, money and good health.

(26)

A.You can imagine that you are a sport professional.

B.You can imagine your cause.

C.You can imagine a beautiful picture.

D.You can imagine the outcome that you want.

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第2题

听力原文:If you are someone who tends to focus on the negative, [31] thinking positively m

听力原文: If you are someone who tends to focus on the negative, [31] thinking positively may be a new skill for you. One way to keep a positive attitude about yourself is by writing down and saying several sentences. The sentences should be strong, supportive statements about yourself such as "I am a confident and capable person who can handle challenges." It's hard to feel defeated when your self-talk is positive. Another technique for reducing stress is positive images. When confronted with a problem, [29] try to imagine the outcome that you want. This technique is used by sport professionals with tremendous success. You too can champion your cause by mentally picturing positive results. Sometimes people are faced with unfortunate circumstances that can not be changed. In these instances, it may help to [30] think about some of the assets and resources that you have that can support you and help you cope such as family, friends, skills, education, money and good health.

(30)

A.You can imagine that you are a sport professional.

B.You can imagine your cause.

C.You can imagine a beautiful picture.

D.You can imagine the outcome that you want.

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第3题

听力原文:W:Prefer to be housewives? Can you imagine the monotony,the boredom and the frust
ration?

M:Oh,yes,I can imagine it easily enough.But don't forget that lots of men have equally bonng jobs and less freedom to do them by their own way.

Q:What does the man imply?

(17)

A.A lot of men have interesting jobs.

B.A lot of men have equally boring jobs.

C.A lot of men have freedom to their jobs.

D.A lot of men think that to be a housewife is easy.

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第4题

听力原文:M: I think I'm more interested in sports now. I can't imagine how I can live with
out sports.

W: Don't you think you should spend more time on your studies? Remember you've failed your exams three times up till now.

What does the woman think the man should do?

A.She thinks that the man should be more interested in sports.

B.She thinks that the man should work harder on his studies.

C.She thinks it is worthwhile for him to do so.

D.She thinks he is right.

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第5题

听力原文:M: I've been skipping classes because of the operation. I imagine I've got to do
some "catch-up" jobs very soon.

W: Well, I can keep you up to date on what we've been doing so far.

Q: What does the woman mean?

(14)

A.She will do the jobs for him.

B.She will inform. him of what he missed.

C.She will inform. him of the dates.

D.She doesn't think they have been doing that much to be concerned.

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第6题

听力原文: Can you imagine ice that does not melt and is not wet.'? Have you ever heard of
dry ice? Dry ice is made by freezing a gas. It is quite different from ordinary ice, which is simply frozen water.

Dry ice was first manufactured in 1925. It has fulfilled the hopes of its inventor. It can be used for making artificial fog in the movies. When steam is passed over dry ice, a very dense vapor rises. It can also be used for destroying insects in grain supplies. It is more practical than ordinary ice be cause it takes up less space and is 142 degrees colder. Since it turns into steam instead of melting in to water, it is cleaner to use. For these reasons it is extremely popular, and many people prefer it to ordinary ice.

What is dry ice made of?

A.Chemicals.

B.Vapour.

C.Water.

D.Gas.

点击查看答案

第7题

听力原文:Why do we cry? Can you imagine life without tears? Not only do tears keep your ey

听力原文: Why do we cry? Can you imagine life without tears? Not only do tears keep your eyes lubricated, they also contain a substance that kills certain bacteria so they can't infect your eye. Give up your tears, and you'll lose this onthespot defense. Nobody wants to give up the flood of extra tears you produce when you get something physical or chemical in your eyes. Tears are very good at washing this irritating stuff out. Another thing you couldn't do without your tears is cry from joy, anger or sadness. Humans are the only animals that produce tears in response to emotions, and most people say a good cry makes them feel better. Many scientists, therefore, believe that crying somehow helps us cope with emotional situations. Tear researcher, Winifred, is trying to figure out how it hap pens. One possibility he says is that tears discharge certain chemicals from your body, chemicals that build up during stress. When people talk about crying it out, "I think that might actually be what they are doing", he says. If Fred is right, what do you think will. happen to people who restrain their tears? Boys, for example, cry only about a quarter as often as girls once they reach teenage years, and we all cry a lot less now than we did as babies. Could it possibly be that we face less stress? Maybe we found another ways to deal with it, or maybe we just feel embarrassed.

(33)

A.Why people hold back their team.

B.Why people cry.

C.How to restrain one's mars.

D.How tears are produced.

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第8题

听力原文:M: I really appreciate your filling me in on yesterday's lecture.W: No problem. I

听力原文:M: I really appreciate your filling me in on yesterday's lecture.

W: No problem. I thought you might want to go over it together. And, anyway, it helps me review. Hope you're feeling better now.

M: I am. Thanks. So, you said she talked about squid.'? Sounds a little strange.

W: Well, actually, it was about the evolution of sea life -- a continuation from last week. The octopus and the squid descended from earlier creatures with shells. They survived by shedding their shells somewhere between 200 and 500 million years ago.

M: That's a pretty long span of time.

W: I know. That's what she said, though. To be precise. "Exactly when they emerged is uncertain …and why is still unexplained."

M: Some squid are really huge. Can you imagine something that big if it still had a shell?

W: Actually, it's because they lost their shells that they could evolve to a bigger size.

M: Makes sense. But some are really huge. I've read about fishermen that caught squid that weighed over a ton. Did she talk about how that happens?

W: Not really. But she did mention some unusual cases. In 1933 in New Zealand they caught a squid…let's see here… it was twenty—two yards long. Its eyes were eighteen inches across. Can you imagine?

M: Reminds me of all those stories of sea monsters.

W: Dr. Simpson thinks there are probably even larger ones that haven't been found because squid are intelligent and fast—so they can easily get away from humans. Maybe some of those monster stories are true.

(20)

A.Mating habits of squid and octopus.

B.The evolution of certain forms of sea life.

C.The study of marine shells.

D.Survival skills of sea creatures.

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第9题

听力原文:Did you know that there's a kind of bird that can sew? This bird, called the tail

听力原文: Did you know that there's a kind of bird that can sew? This bird, called the tailor bird, uses its mouth as a needle. It sews leaves together in the shape of a cup. Then it adds a layer of straw to the inside of the cup and lays its eggs there.

Each bird species builds its own special kind of nest. The most common materials used for nests are grasses, branches and feathers. A bird must weave these materials into a nest. Just imagine building a house without cement or nails to hold together.

Another bird is called the weaver bird. 'The weaver bird builds a nest that looks like a basket. The nest is shaped like a pear with a hole in the middle. The hole is the door of the nest.

A third bird is called the oven bird. The oven bird makes a nest that is very solid. The nest is made of mud. The oven bird forms the mud into the shape of an oven and then let it dry in the sun. The sun bakes. the mud, making it very hard.

Not all birds make their homes in branches. Some birds build their nests on the ground, while others bury their eggs under the ground. And some birds do not build nests at all.

So when you look for nests and eggs in the branches of the trees and bushes, remember, that some nests may be right trader your feet.

(26)

A.A cup.

B.An oven.

C.An egg.

D.A basket.

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