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 (大气). Light is “bent (弯曲的)” 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 (天文学家) since they cannot observe the stars clearly. A telescope (望远镜) 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.
根据短文内容，选择最佳选项。 （10分）
【小题1】What happens to the light from the stars we see when the air in the earth’s atmosphere is moving?

First Frenchman: I once heard someone shout, “Look out,” I put my head out of a window and a basin (盆) of water fell on me. It seems that “Look out” may mean “don’t look out.”
　　Second Frenchman: Once I was on a ship and heard the captain (船长) shout, “All hands on deck,” I put my hands on the deck and someone walked on them.
　　Third Frenchman: I once visited an English friend early in the morning and the maid who came to the door and said, “He’s not up yet. Come back in half an hour,” When I went again for him, she said, “He’s not down yet.”
　　“If he’s not up and he’s not down, where is he?” I asked.
She said, “He’s still in bed. When I say ‘He’s not up ’  I mean ‘he has not yet got up’. When I say‘He’s not down ’I mean ‘he has not yet come downstairs.”
【小题1】“Look out”here means “ _______”.

First Frenchman: I once heard someone shout, “Look out,” I put my head out of a window and a basin (盆) of water fell on me. It seems that “Look out” may mean “don’t look out.”

　　Second Frenchman: Once I was on a ship and heard the captain (船长) shout, “All hands on deck,” I put my hands on the deck and someone walked on them.

　　Third Frenchman: I once visited an English friend early in the morning and the maid who came to the door and said, “He’s not up yet. Come back in half an hour,” When I went again for him, she said, “He’s not down yet.”

　　“If he’s not up and he’s not down, where is he?” I asked.

She said, “He’s still in bed. When I say ‘He’s not up ’  I mean ‘he has not yet got up’. When I say‘He’s not down ’I mean ‘he has not yet come downstairs.”

1.“Look out”here means “ _______”.

A. put your head out of the window and look

B. Take care

C. I’m going to pour the water

D. Help me

2.“All hands on deck”means “ _______ ”.

A. All the sailors gather ( 集合 )on deck

B. Give your hands to me

C. Put your right hand and left hand on deck

D. Shake your hands with me

3.When the third Frenchman went back, the English friend _______ .

A. was washing his face

B. was having his breakfast

C. was still in an upstairs room

D. was reading a newspaper

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 (大气). Light is “bent (弯曲的)” 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 (天文学家) since they cannot observe the stars clearly. A telescope (望远镜) 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.

根据短文内容，选择最佳选项。 （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.