题目列表(包括答案和解析)
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.
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. |
| A．rainy days | B．shiny days |
| C．cloudy days | D．windy days |
| A．The rock gets broken. |
| B．The rock becomes unclear. |
| C．The water becomes much polluted. |
| D．The water does not move anymore. |
| A．watch | B．listen | C．draw | D．explain |
| 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. |
阅读下面短文，将方框内所给句子抄写在短文的适当位置，使短文意思完整。
Giving directions in different places
If you ask people of different countries“Could you tell me the way to the post office?”．you will get different answers．
In Japan, people use landmarks(路标)instead of street names．For example, the Japanese will say to travelers,“Go straight down to the comer． 1 The post office is across from the bus stop．”
In Kansas, America, there are no towns or buildings within(在……之内)miles．So instead of landmarks, people will tell you directions and distance．For example, people will say,“Go north two miles(英里)． 2 ．”
People in Greece sometimes do not even try to give directions．They will often say,“Follow me．” 3 ．
Sometimes if a person doesn't know the answer to your question, he or she, like a New Yorker, might say,“Sorry, I have no idea．”But in Yucatan, Mexico, no one answers“I don't know．” 4 They usually give an answer, but often a wrong one．A visitor can often get lost in Yucatan!
5 You might not understand a person‘s words, but maybe you can understand his or her body language．He or she will usually point to the correct direction．Go on in that direction and you may find the post office!
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