One day, a teacher was giving a speech to his students .He held up(举起)a glass of water and asked the class. "How heavy do you think this glass of water is ?"
The students' answers ranged(范围) from 20g to 500g .
"It does not matter on the weight itself .It depends on how long you hold it .If I hold it for a minute ,it is OK. If I hold it for an hour ,I will have an ache in my right arm .If I hold it for a day ,you will have to call an ambulance(救护车).It is exactly the same weight ,but the longer I hold it ,the heavier it becomes."
"If we carry our burdens (负担)all the time, sooner or later ,we will not be able to carry on ,the burden becoming increasingly heavier ."
"What you have to do is to put the glass down ,rest for a while before holding it up again ."
We have to put down the burden sometimes ,so that we can be refreshed and are able to carry on .
So before you return home from work tonight ,put the burden of work down .Don't carry it back home. You can pick it up tomorrow .
Whatever burdens you are having now on your shoulders, let it down for a moment if you can .
【小题1】The teacher brought a glass of water to the class because ______
A. he was very thirsty  B. his arms were strong  C. it was a good example
【小题2】"A glass of water " in this passage referred to (指)______
A. knowledge  B. the burden  C .the time
【小题3】Accordign to the teacher ,you may feel ______if you put down the burden sometimes.
A. more energetic  B. much heavier  C. more stressed out (压力、紧张)
【小题4】This was a lesson about______
A. how to relax oneself in life  B. how to solve a physics problem .
C. how to keep fit by drinking water
【小题5】Which of the following statements is TRUE according to the passage ?
A .You could become heavier and heavier if you held a glass of water in your hand .
B. All the students in the class knew what the weight of the glass of water exactly was
C. The teacher had a good way of making his lesson clear and easy to be understood

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?

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.
【小题2】Scintillation also happens on      according to the passage.
A.rainy daysB.shiny days
C.cloudy daysD.windy days
【小题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.
【小题4】The underlined word “observe” means “    ”.
A.watchB.listenC.drawD.explain
【小题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.

The earth is our home. We must take care of it. Life today is easier than it was        years ago, but it has brought some new problems. One of the biggest problems is pollution(污染). We can see it, smell it, drink it and even       it. Man has polluted the        . The more people, the more pollution.Many years ago, the problem was not so serious because there were not so       people. When the land was used up (用光), the river was not clean in a place,man went to       place. Now man is slowly polluting the whole world       pollution is still the most serious, it’s bad for       things in the world.Many countries don’t le t people burn       for air in houses and factories in the city. Pollution by SO2 is now the most dangerous kind of       pollution. It’s caused by heavy traffic. People say it’s       to ride bikes. When you are       , there is no pollution. But even in developed countries, most people don’t go to work by bike. It’s not      bikes are expen sive or people are tired if they ride to work. It’s because the number of cars on the roads becomes larger. So more people       their bikes and go to work by cars,  then things are getting       . We should have special roads only for bikes and make it       difficult and expensive for drivers to take their cars into the city that they will go back to use their bikes. 

1.A. hundred       B. hundreds of      C. hundred of      D. hundreds 

2.A. listen         B. listen to         C. hear of        D. hear 

3.A. moon          B. star               C. earth             D. sun 

4.A. lot            B. little             C. many             D. much  

5.A. others        B. the others       C. the other        D. another  

6.A. Air           B. Food              C. Water            D. Noise  

7.A. life           B. live              C. living            D. lives 

8.A. something bad              B. bad something  

C. something good              D. good something 

9.A. water           B. air             C. noise          D. white 

10.A. least           B. best            C. most             D. worst 

11.A. driving       B. biked           C. riding           D. ridden 

12.A. why             B. because          C. what              D. how 

13.A. put on          B. look at         C. put away        D. look up 

14.A. better and better              B. more and more  

C. worse and worse                     D. bigger and bigger 

15.A. quite            B. such              C. very               D. so

 

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