When you look up into the sky at night, have you ever felt that your eyes are playing tricks on (捉弄) you? It seems that the stars are moving all the time.

Actually, there is nothing wrong with your eyes. This twinkling effect is called scintillation (交光). Scintillation happens because of air movements in the earth’s atmosphere (大氣). Light is “bent (彎曲的)” when it travels through different parts of the earth’s atmosphere. As the air in the earth’s atmosphere is moving all the time, the light from the stars looks as if it is moving too.

The same thing also happens to things on the ground. On a very hot and shiny day, if you look at the road, the image in the distance is not clear and things move slightly. You can also see the same effect if you drop a rock into water. The rock appears a little unclear under the moving water.

This twinkling effect causes a lot of problems for astronomers (天文學家) since they cannot observe the stars clearly. A telescope (望遠鏡) was sent into space so that the air movements in the atmosphere could be avoided (避免). It took a long time to build the space telescope but finally in 1990, a huge space telescope called the Hubble Space Telescope was successfully sent into space. Since then, astronomers have many important observations that have helped people understand space better.

根據(jù)短文內(nèi)容，選擇最佳選項。 （10分）

1.What happens to the light from the stars we see when the air in the earth’s atmosphere is moving?

A．It looks even brighter.

B．It looks as if it is bent.

C．It looks as if it is moving.

D．It looks like drops of rain.

2.Scintillation also happens on 　　　　 according to the passage.

A．rainy days                             B．shiny days

C．cloudy days                            D．windy days

3.What can you see when you drop a rock into the water?

A．The rock gets broken.

B．The rock becomes unclear.

C．The water becomes much polluted.

D．The water does not move anymore.

4.The underlined word “observe” means “　　　　”.

A．watch            B．listen             C．draw             D．explain

5.Why is scintillation a problem for astronomers?

A．The stars never stay still.

B．It makes the stars too dark to see.

C．It makes astronomers feel too hot to work.

D．Astronomers cannot observe the stars clearly.

When you look up into the sky at night, have you ever felt that your eyes are playing tricks on (捉弄) you? It seems that the stars are moving all the time.
Actually, there is nothing wrong with your eyes. This twinkling effect is called scintillation (交光). Scintillation happens because of air movements in the earth’s atmosphere (大氣). Light is “bent (彎曲的)” when it travels through different parts of the earth’s atmosphere. As the air in the earth’s atmosphere is moving all the time, the light from the stars looks as if it is moving too.
The same thing also happens to things on the ground. On a very hot and shiny day, if you look at the road, the image in the distance is not clear and things move slightly. You can also see the same effect if you drop a rock into water. The rock appears a little unclear under the moving water.
This twinkling effect causes a lot of problems for astronomers (天文學家) since they cannot observe the stars clearly. A telescope (望遠鏡) was sent into space so that the air movements in the atmosphere could be avoided (避免). It took a long time to build the space telescope but finally in 1990, a huge space telescope called the Hubble Space Telescope was successfully sent into space. Since then, astronomers have many important observations that have helped people understand space better.

1. 1.

   What happens to the light from the stars we see when the air in the earth’s atmosphere is moving?

   1. A.
      It looks even brighter
   2. B.
      It looks as if it is bent
   3. C.
      It looks as if it is moving
   4. D.
      It looks like drops of rain
2. 2.

   Scintillation also happens on 　　　　 according to the passage.

   1. A.
      rainy days
   2. B.
      shiny days
   3. C.
      cloudy days
   4. D.
      windy days
3. 3.

   What can you see when you drop a rock into the water?

   1. A.
      The rock gets broken
   2. B.
      The rock becomes unclear
   3. C.
      The water becomes much polluted
   4. D.
      The water does not move anymore
4. 4.

   The underlined word “observe” means “　　　　”.

   1. A.
      watch
   2. B.
      listen
   3. C.
      draw
   4. D.
      explain
5. 5.

   Why is scintillation a problem for astronomers?

   1. A.
      The stars never stay still
   2. B.
      It makes the stars too dark to see
   3. C.
      It makes astronomers feel too hot to work
   4. D.
      Astronomers cannot observe the stars clearly

When you look up into the sky at night, have you ever felt that your eyes are playing tricks on (捉弄) you? It seems that the stars are moving all the time.

Actually, there is nothing wrong with your eyes. This twinkling effect is called scintillation (交光). Scintillation happens because of air movements in the earth’s atmosphere (大氣). Light is “bent (彎曲的)” when it travels through different parts of the earth’s atmosphere. As the air in the earth’s atmosphere is moving all the time, the light from the stars looks as if it is moving too.

The same thing also happens to things on the ground. On a very hot and shiny day, if you look at the road, the image in the distance is not clear and things move slightly. You can also see the same effect if you drop a rock into water. The rock appears a little unclear under the moving water.

This twinkling effect causes a lot of problems for astronomers (天文學家) since they cannot observe the stars clearly. A telescope (望遠鏡) was sent into space so that the air movements in the atmosphere could be avoided (避免). It took a long time to build the space telescope but finally in 1990, a huge space telescope called the Hubble Space Telescope was successfully sent into space. Since then, astronomers have many important observations that have helped people understand space better.

根據(jù)短文內(nèi)容，選擇最佳選項。 （10分）

(　 )36. What happens to the light from the stars we see when the air in the earth’s atmosphere is moving?

　　 　　 A. It looks even brighter.　　　

B. It looks as if it is bent.

　　 　　 C. It looks as if it is moving.　　

D. It looks like drops of rain.

(　 )37. Scintillation also happens on 　　　　 according to the passage.

　　 　　 A. rainy days 　　 B. shiny days

　　 　　 C. cloudy days 　 D. windy days

(　 )38. What can you see when you drop a rock into the water?

　　 　　 A. The rock gets broken.　　　　

B. The rock becomes unclear.

　　 　　 C. The water becomes much polluted.

D. The water does not move anymore.

(　 )39. The underlined word “observe” means “　　　　”.

　　 　　 A. watch　　　 　 B. listen　　　 　 C. draw　　　 　 D. explain

(　 )40. Why is scintillation a problem for astronomers?

　　 　　 A. The stars never stay still.

B. It makes the stars too dark to see.

　　 　　 C. It makes astronomers feel too hot to work.

　　 　　 D. Astronomers cannot observe the stars clearly.

How many things can you see in the night sky? A lot! On a clear night you can see the moon, some planets, and thousands of sparking stars.
You can see even more with a telescope. You might see that many stars look larger than others. You might see that some stars that look white are really red or blue. 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 and 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 gases run out, the star stops burning and begins to die.
So next time you look up at the night sky, remember: there’s more in the sky than we can see!

1. 1.

   On a clear night we might see things except______

   1. A.
      the moon
   2. B.
      some planets
   3. C.
      sparkling stars
   4. D.
      the sun
2. 2.

   How can we see even more in the sky?

   1. A.
      By using a telescope
   2. B.
      By using a microscope
   3. C.
      By climbing up to the top of a mountain
   4. D.
      By going outside on a clear night
3. 3.

   What does the underlined word”invisible”mean in Chinese?

   1. A.
      看不見的
   2. B.
      聽不見的
   3. C.
      摸不著的
   4. D.
      無形的
4. 4.

   When a star’s gases_______,the star begins to die

   1. A.
      burn
   2. B.
      run out
   3. C.
      give off heat
   4. D.
      get weak
5. 5.

   Which of the following is NOT TRUE according to the passage?

   1. A.
      We might see that many stars look larger than others with a telescope
   2. B.
      We might see that some stars that look white are really red and blue with a telescope
   3. C.
      We can see some objects in more and more detail with bigger and bigger telescopes
   4. D.
      The sun certainly seems to be getting old and weak

How many things can you see in the night sky? A lot! On a clear night you can see the moon, some planets, and thousands of sparking stars.

You can see even more with a telescope. You might see that many stars look larger than others. You might see that some stars that look white are really red or blue. 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 and 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 gases run out, the star stops burning and begins to die.

So next time you look up at the night sky, remember: there’s more in the sky than we can see!

1.On a clear night we might see things except______.

A．the moon         B．some planets       C．sparkling stars      D．the sun

2.How can we see even more in the sky?

A．By using a telescope

B．By using a microscope

C．By climbing up to the top of a mountain

D．By going outside on a clear night.

3.What does the underlined word”invisible”mean in Chinese?

A．看不見的         B．聽不見的          C．摸不著的         D．無形的

4.When a star’s gases_______,the star begins to die.

A．burn             B．run out           C．give off heat       D．get weak

5.Which of the following is NOT TRUE according to the passage?

A．We might see that many stars look larger than others with a telescope

B．We might see that some stars that look white are really red and blue with a telescope.

C．We can see some objects in more and more detail with bigger and bigger telescopes.

D．The sun certainly seems to be getting old and weak.

When you look up into the sky at night, have you ever felt that your eyes are playing tricks on (捉弄) you? It seems that the stars are moving all the time.
Actually, there is nothing wrong with your eyes. This twinkling effect is called scintillation (交光). Scintillation happens because of air movements in the earth’s atmosphere (大氣). Light is “bent (彎曲的)” when it travels through different parts of the earth’s atmosphere. As the air in the earth’s atmosphere is moving all the time, the light from the stars looks as if it is moving too.
The same thing also happens to things on the ground. On a very hot and shiny day, if you look at the road, the image in the distance is not clear and things move slightly. You can also see the same effect if you drop a rock into water. The rock appears a little unclear under the moving water.
This twinkling effect causes a lot of problems for astronomers (天文學家) since they cannot observe the stars clearly. A telescope (望遠鏡) was sent into space so that the air movements in the atmosphere could be avoided (避免). It took a long time to build the space telescope but finally in 1990, a huge space telescope called the Hubble Space Telescope was successfully sent into space. Since then, astronomers have many important observations that have helped people understand space better.
根據(jù)短文內(nèi)容，選擇最佳選項。 （10分）
【小題1】What happens to the light from the stars we see when the air in the earth’s atmosphere is moving?