Our sun is a star, and nine worlds move round it. Worlds like these are planets .But there are other stars, other suns. Not only thousands of them, but millions of them. Do different stars have planet 题目和参考答案——青夏教育精英家教网—

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Our sun is a star, and nine worlds move round it. Worlds like these are planets (行星).
But there are other stars, other suns. Not only thousands of them, but millions of them. Do different stars have planets? We can see the planets round our own sun. But we haven’t seen any more. The stars are too far away from us. Stars give out (发出)light, but the planets don’t have any light of their own. So we can’t see them. They’re too far, and too dark.
Still, we can tell that some stars have planets. While a big planet goes round, it pulls its star to one side. And sometimes we can see this, Then we know that the star has a planet.
For example, Barnard’s Star（巴纳德星）is a small red star. And it is the quickest star in the universe. But sometimes it moves slower, and then quicker again. We have know Barnard’s Star for many years, and now we are sure it has a planet.
【小题1】A star is a large body in the universe.it________.

A．moves round our sun	B．has light of its own
C．can also be called a world	D．both B and C

【小题2】Which of the following is not true?

A．The earth is one of sun’s worlds	B．There are millions of suns in the universe.
C．The worlds are very bright.	D．Some stars have planets

【小题3】Barnard’s Star moves more quickly than _______.

A．most stars	B．any other star
C．its planet	D．the planets round the sun

【小题4】How can people know that there is a plante round Barnard’s Star?

A．Sometimes they see that the planet pulls the star to one side and makes it move slower .	B．The planet is shining.
C．The planet is next to our earth.
D．The planet is a red one.

【小题1】B
【小题2】C
【小题3】B
【小题4】A

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　　It is ten o'clock at night and you are outside. You can see many stars in the sky. Each star is another sun. The sky is big, and it hag many suns.

　　Our sun is near to us. It warms us and gives us light in daytime. The stars are not near. We can see their light only at night, and they do not warm us.

　　The stars are not all the same. Many stars are quite like our sun. They are the same size, and they have the same colour, yellow. Other stars are bigger or smaller. A “giant(巨人)” star is very, very big. A “dwarf(侏儒)”is a small star—smaller than the sun.

　　Stars have different colours, too. They can be blue, orange, yellow, white or red. There are giants and dwarfs in all these colours. All stars are, of course, very hot. The hottest stars are the blue ones. White stars come next, they are less hot. Then yellow and orange stars are less hot again. Red stars are the least hot, and they are also the oldest stars.

　　Light moves very quickly across the sky, eighteen million (18,000,000)kilometers in a minute. Our nearest star is a red dwarf. Its name is Proxima Centauri ( proxima ＝ nearest), and it gives a weak, red light. We can just see this light. It left Proxima Centauri 4.25 years ago, and now tonight, it is reaching cur eyes. Think about it! In one minute, 18,000,000 kilometres. So, in 4.25 years—well, how many kilometers? You can find the answer yourself.

　　I will just say this: Proxima Centauri is a long way from us.

1．According to the temperatures on stars, the right order from the lowest temperature to the highest is ________.

[　　]

A．red→yellow→white→blue

B．orange→red→blue→white

C．blue→white→yellow→red

D．white→blue→orange→red

2．All the following am right except ________.

[　　]

A．a “dwarf” is smaller than the sun

B．there are dwarfs in different colours

C．a “dwarf” is a small star

D．dwarfs are the least hot

3．How far away is the star Proxima Centauri from us?

[　　]

A．40,208,400,000,000 kilometres.

B．9,460,800,000,000 kilometres.

C．679,140,000,000 kilometres .

D．279,225,000,000 kilometres .

4．When we say “The star Procyon is ‘ten light years’ away.”, we mean ________.

[　　]

A．we can reach the star in ten years

B．we first saw the star ten years ago

C．the light left Procyon ten years ago

D．Procyon has been that far away for ten years

Our sun is a star, and nine worlds move round it. Worlds like these are planets (行星).

But there are other stars, other suns. Not only thousands of them, but millions of them. Do different stars have planets? We can see the planets round our own sun. But we haven’t seen any more. The stars are too far away from us. Stars give out (发出)light, but the planets don’t have any light of their own. So we can’t see them. They’re too far, and too dark.

Still, we can tell that some stars have planets. While a big planet goes round, it pulls its star to one side. And sometimes we can see this, Then we know that the star has a planet.

For example, Barnard’s Star（巴纳德星）is a small red star. And it is the quickest star in the universe. But sometimes it moves slower, and then quicker again. We have know Barnard’s Star for many years, and now we are sure it has a planet.

A star is a large body in the universe.it________.

A.moves round our sun B.has light of its own

C.can also be called a world D.both B and C

Which of the following is not true?

A.The earth is one of sun’s worlds B.There are millions of suns in the universe.

C. The worlds are very bright. D.Some stars have planets

Barnard’s Star moves more quickly than _______.

A.most stars B.any other star

C.its planet D.the planets round the sun

How can people know that there is a plante round Barnard’s Star?

A.Sometimes they see that the planet pulls the star to one side and makes it move slower

. B.The planet is shining.

C.The planet is next to our earth.

D.The planet is a red one.

Our sun is a star, and nine worlds move round it. Worlds like these are planets (行星).

Still, we can tell that some stars have planets. While a big planet goes round, it pulls its star to one side. And sometimes we can see this, Then we know that the star has a planet.

1.A star is a large body in the universe.it________.

A．moves round our sun	B．has light of its own
C．can also be called a world	D．both B and C

2.Which of the following is not true?

A．The earth is one of sun’s worlds	B．There are millions of suns in the universe.
C．The worlds are very bright.	D．Some stars have planets

3.Barnard’s Star moves more quickly than _______.

A．most stars	B．any other star
C．its planet	D．the planets round the sun

4.How can people know that there is a plante round Barnard’s Star?

A．Sometimes they see that the planet pulls the star to one side and makes it move slower

B．The planet is shining.

C．The planet is next to our earth.

D．The planet is a red one.

(江西省抚州一中2009届高三第四次模拟考试B篇)

How many things can you see in the night sky? A lot! On a clearnight you might see the Moon, some planets, and thousands of sparkling stars.

You can see even more with a telescope. And with bigger and bigger telescopes you can see more and more objects in the sky. And you can see those objects in more and more detail.

But scientists believe there are some things in the sky that we will never see. We won't see them with the biggest telescope in the world, on the clearest night of the year.

That's because they're invisible. They're the mysterious dead stars called black holes.

You might find it hard to imagine that stars die. After all, our Sun is a star. Year after year we see it up in the sky, burning brightly, giving us heat and light. The Sun certainly doesn't seem to be getting old or weak. But stars do burn out and die after billions of years.

As a star's gases burn, they give off light and heat. But when the gas runs out, the star stops burning and begins to die.

As the star cools, the outer layers of the star pull in toward the center. The star squashes into a smaller and smaller ball. If the star was very small, the star ends up as a cold, dark ball called a black dwarf. If the star was very big, it keeps squashing inward until it's packed together tighter than anything in the universe.

Imagine if the Earth were crushed until it was the size of a tiny marble. That's how tightly this dead star, a black hole, is packed. What pulls the star in toward its center with such power? It's the same force that pulls you down when you jump--the force called gravity. A black hole is so tightly packed that its gravity sucks in everything--even light. The light from a black hole can never come back to your eyes. That's why you see nothing but blackness.

So next time you stare up at the night sky, remember: there's more in the Sky than we can see! Scattered in the silent darkness are black holes--the great mystery of space.

60. According to the article, what causes a star to die?

A. As its gases run out, it cools down. B. It has a collision with other stars.

C. It can only live for about a million years.

D. As it gets hotter and hotter, it explodes.

61. Which of the following statements is NOT true?

A. Black holes are dead stars.

B. Black holes have gravity.

C. Black holes are invisible.

D. There is nothing as mysterious as a black hole.

62. W. hat happens AFTER a star dies?

A. It becomes invisible. B. It fails to Earth.

C. It burns up all of its gases. D. It becomes brighter and easier to see.

63. Why can't you see light when you look at a black hole?

A. Because most black holes are so far away.

B. Because the gravity of a black hole is so strong that it sucks the light inward.

C. Because as the star's gases burn, it stops giving off heat and light.

D. Because as a star cools, its outer layers pull in toward its center.

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