A black hole is created when a large star burns out. Like our sun, stars are unbelievably hot furnaces(熔爐) that burn their own matter as fuel. When most of the fuel is used up, the star begins to die.

The death of a star is not a quiet event. First there is a huge explosion. As its outer layer is blasted off into space, the dying star shines as brightly as a billion suns.

After the explosion gravity pulls in what’s left of the star. As the outside of the star sinks toward the center, the star gets smaller and smaller. The material the star is made of becomes tightly packed together. A star is so dense that a teaspoon of matter from it weighs billion of pounds.

The more the star shrinks, the stronger the gravity inside it becomes. Soon the star is very tiny, and the gravity pulling it in is unbelievably strong. In fact, the gravity is so strong that it even pulls light into the star! Since all the light is pulled in, none can go out. The star becomes black when there is no light. Then a black hole is born!

That’s what we know about black holes. What we don’t know is this: What happens inside a black hole after the star has been squeezed into a tiny ball? Does it keep getting smaller and smaller forever? Such a possibility is hard to imagine.

But if the black hole doesn’t keep shrinking, what happens to it? Some scientists think black holes are like doorways to another world．They say that as the star disappears from our universe, it goes into another universe. In other words a black hole in our universe could turn into a “white hole” in a different universe. As the black hole swallows light, the white hole shines brightly — somewhere else. But where? A different place, perhaps, or a different time — many years in the past or future.

Could you travel through a black hole? Right now, no. Nothing we know of could go into a black hole without being crushed．So far the time being, black hole must remain a mystery.

Black holes are a mystery—but that hasn’t stopped scientists from dreaming about them. One scientist suggested that in the future we might make use of the power of black holes. They would supply all of Earth’s energy needs, with plenty to spare. Another scientist wondered if a black hole could some day be used to swallow earthly waste—a sort of huge waste disposal (處理) in the sky!

When the star begins to die ______.

       A．there is no fuel left in it B．its outer layer goes into space first

       C．a(chǎn) huge explosion will happen        D．it doesn’t give off light any longer

Which of the following doesn’t help produce a black hole?

       A．The gravity inside the star is very strong.

       B．The light can’t go out of the star.

       C．The star becomes smaller and smaller

       D．The dying star shines very brightly.

The black hole ______.

       A．continues becoming smaller and smaller all the time

       B．goes into another universe and becomes a white hole

       C．can pull in everything we know of in the world

       D．will appear at another place at a different time

What’s the best title for this passage?

       A．A New Scientific Discovery: Black Holes

       B．How Do Black Holes Come Into Being?

       C．What Are Black Holes?

       D．Travel Through A Black Hole

【小題1】C

【小題2】D

【小題3】C

【小題4】C


解析:

【小題1】細(xì)節(jié)理解題。根據(jù)第二段第二句可知。

【小題2】細(xì)節(jié)理解題。D項(xiàng)是黑洞形成前的現(xiàn)象。

【小題3】 根據(jù)倒數(shù)第二段“Nothing we know of could go into a black hole without being crushed.”可知。其余三項(xiàng)都是科學(xué)家們的猜測。

【小題4】主旨大意題。題目的選擇應(yīng)具有高度的概括性、強(qiáng)烈的針對性及一定的醒目性。首先可排除A項(xiàng)，因?yàn)楹诙丛缫巡辉偈切迈r的話題。B、D兩項(xiàng)只是短文的兩個(gè)方面。

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Tess still stood hesitating like a swimmer about to make his dive, hardly knowing whether to return or move forward, when a figure came out from the dark door of the tent. It was a tall young man, smoking.
He had an almost black face, though red and smooth. His moustache was black with curled points, though he could not be more than twenty-three or-four. There was all unusual force in his face, and in his daring rolling eyes.
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“Ay, ay; I mean d’Urbervilles.”
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“I suppose I have,” looking less confident and uncomfortable again.
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C. a gentle and reliable man                             D. older than she had expected
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D
Tess still stood hesitating like a swimmer about to make his dive, hardly knowing whether to return or move forward, when a figure came out from the dark door of the tent. It was a tall young man, smoking.
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This differed greatly from what Tess had expected. She had dreamed of an aged and dignified face. She tried to keep calm and answered-“I came to see your mother, sir.”
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“It isn’t business-it is-I can hardly say what.”
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“Oh no. Why, sir, if I tell you, it will seem…”
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“Ho! Poor relations!”
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“Ay, ay; I mean d’Urbervilles.”
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  Tess still stood hesitating like a swimmer about to make his dive, hardly knowing whether to return or move forward, when a figure came out from the dark door of the tent. It was a tall young man, smoking.

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‘I came to see your mother, sir.’

‘I am afraid you cannot see her---she is ill in bed,’ replied the representative of the house; for this was Mr. Alec, the only son of the noble family. ‘What is the business you wish to see her about?’

‘It isn’t business---it is ---I can hardly say what!’

‘Pleasure?’

‘Oh no. Why, sir, if I tell you, it will seem--- ’

Tess’s sense of a certain ridicule was now so strong that, despite her general discomfort at being here, her rosy lips curved(彎曲) towards a smile, much to the attraction of the young man.

‘It is so foolish’, she stammered(結(jié)結(jié)巴巴地說); ‘I fear I can’t tell you!’

‘Never mind; I like foolish things. Try again, my dear,’ said he kindly.

‘Mother asked me to come,’ Tess continued; ‘a(chǎn)nd, indeed, I was in the mind to do so myself. But I did not think it would be like this. I came, sir, to tell you that we are of the same family as you.’

‘Ho! Poor relations?’

‘Yes.’

‘Stokes?’

‘No; d’Urbervilles.’

‘Ay, ay; I mean d’Urbervilles.’

‘Our names are worn away to Durbeyfield; but we have several proofs that we are d’Urbervilles. The local scholars hold the view that we are, ---and ---and we have an old seal(印章) and a silver spoon marked with the same castle as yours. So mother said we ought to make ourselves known to you, as we’ve lost our horse by a bad accident; we can hardly make a living.’

‘Very kind of your mother, I’m sure.’ Alec looked at Tess as he spoke, in a way that made her uneasy. ‘And so, my pretty girl, you’ve come on a friendly visit to us, as relations?’

‘I suppose I have,’ looking less confident and uncomfortable again.

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   D. To make known their relationship and seek help.

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