题目
题型：不详难度：来源：
But comets are not made of solid rocks like planets. A comet is a ball of dust, stones, and ice. Many people call comets dirty snowballs.
The “snowball” may be only a few miles across. But when the sun heats the “snowball,” much of it is changed to gases. The gases spread out and form the comet’s head, which may be thousands of miles across.
A comet moves fast in its trip around the sun. But when we see it, the comet does not seem to move. That’s because it is so far away. The moon moves fast, but when you look at it, you can’t see any motion(运动). That’s because the moon is far away.
Each year astronomers(天文学家) discover new comets. Some of them are seen only once. They make one trip around the sun and then go away out into space. The sun’s gravity cannot hold them.
Other comets, like Halley, keep returning. They have been captured by the sun. Halley’s earliest visit was probably 3,000 years ago. It may keep returning for another 3,000 years.
But every time a comet goes around the sun, the comet loses part of itself. Gases and dust are pulled out of the comet. That’s why Halley is now dimmer（暗淡的） than it used to be. Next time it visits us, in 2062, it may be even dimmer. Each visit it may get dimmer and dimmer, until it finally disappears.
小题1:What is this passage mostly about?
| A．Comets and the sun. |
| B．Why comets are like snowballs. |
| C．Who discovered the first comet. |
| D．Facts about comets. |
| A．By telling about a famous one. |
| B．By explaining how far away it is. |
| C．By describing how fast it moves. |
| D．By describing it as a dirty snowball. |
| A．To give information about comets. |
| B．To tell readers about famous comets. |
| C．To explain the importance of comets. |
| D．To encourage readers to look for comets. |
答案
小题1:D
小题2:D
小题3:A
解析
小题1:根据文章内容大意可知答案为D
小题2:根据文章内容But comets are not made of solid rocks like planets. A comet is a ball of dust, stones, and ice. Many people call comets dirty snowballs.可知答案为D
小题3:根据文章内容But every time a comet goes around the sun, the comet loses part of itself. Gases and dust are pulled out of the comet. That’s why Halley is now dimmer（暗淡的） than it used to be. Next time it visits us, in 2062, it may be even dimmer. Each visit it may get dimmer and dimmer, until it finally disappears.可知答案为A
核心考点
试题【Comets(彗星) are parts of our solar system. Like the planets, they go around the s】；主要考察你对科普环保类等知识点的理解。[详细]
举一反三
In 2008, the first ice house in North America opens its 2 to welcome some visitors. The floors, windows and walls are all made of ice. It has ten bedrooms 3 twenty people can stay there each night. Visitors to the house 4 in ice beds, sit on ice chairs and eat from ice plates. Well, the toilets are not made of ice, of course.
It’s usually below zero so it is very 5 inside the house. However, do the visitors just sit there to 6 warm? No, visitors have to 7 special clothes. These can make 8 feel warm until morning.
Workers 9 about four weeks designing the ice house. Visitors can only stay in this ice house in winter. It isn’t 10 in hot summer. Because this house is so special, it is becoming popular with young people.
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But unlike middle school students in China, high school students in America take only four or five subjects each term. They usually go to the same classes every day and have homework for every class. After class they do all kinds of interesting things.
After high school, many students go to college. They may go to a small or a large one. They usually have to pay a lot for their higher education. So lots of students work after school to make money for their studies.
小题1:In America, summer vacation lasts（持续）___________________.
| A．one month | B．two months |
| C．three months | D．more than three months |
| A．大学 | B．公司 | C．研究院 | D．高中 |
| A．want to see interesting things |
| B．have to help the other people |
| C．want to make more friends |
| D．have to get money for their studies |
Read the newspaper carefully, we"ll find different types of articles on the pages:
News stories — these stories are about events. Reporters try to show all points of a story to help readers understand what happened. Reporters try to speak to as many people as possible. They also use pictures and numbers to show the readers that the stories are true. The newspaper Teenagers has lots of news stories on the news page and front page. When we read them, we learn more about the facts, not the writers’ ideas.
Opinion writing — opinion writing is usually about something happening right now. But it isn"t just facts. Here writers add their own opinions to the news. Writers pick only the facts that help back up their ideas. They make readers believe that they are telling the truth. This is usually the kind of story that gets people thinking. Go to “Speak Out” on Page Two for an example of opinion writing in Teenagers.
Advertisement — Don’t get happy too early when you read them. Those sweet words and lovely pictures are just ways to get us interested in their products! People have to pay to put advertisements in newspapers!
小题1:The underlined sentence means that the readers "_______".
| A．should understand interesting news stories |
| B．ought to know which kind of things to read |
| C．need to look at the school news first |
| D．must know the contents of all the news |
| A．reporters write different kinds of news |
| B．teenagers get interested in newspapers |
| C．readers can read newspapers in better ways |
| D．readers can’t read different news in newspapers |
In the early years, these schools were nearly the same. Only young men went to college. All the students studied the same subjects, and everyone learned Latin and Greek. Little was known about science. And few people knew that one kind of school could teach everything that was known about the world. When the students graduated, most of them became ministers or teachers.
In 1782, Harvard started a medical school for young men who wanted to become doctors. Later, lawyers could study in Harvard’s law school. In 1825, besides Latin and Greek, Harvard began to teach modern languages, such as French and German. Soon it began to teach American history.
As knowledge increased, Harvard and other colleges began to teach many new subjects. Students were allowed to choose the subjects that interested them.
Today, there are many different kinds of colleges and universities. Most of them are made up of smaller schools that deal with special fields of learning. There’s so much to learn that one kind of school can’t offer all.
小题1:In the early years, people learned ________ in colleges.
| A．science | B．medicine | C．law | D．Latin and Greek |
| A．ministers or teachers | B．lawyers | C．doctors | D．workers |
| A．In the early years, everyone can go to colleges. |
| B．In 1782, Harvard began to teach German. |
| C．In the early years, different colleges majored in different fields. |
| D．More and more courses were taught in college with the improvement of knowledge. |
a. law
b. French and German
c. Latin and Greek
d. medicine
e. American history
| A．d-b-e-c-a | B．a-d-b-c-e | C．c-d-a-b-e | D．c-d-b-e-a |
| A．can learn everything they are interested in |
| B．go to different smaller schools that deal with special fields of learning |
| C．learn the same subjects |
| D．must learn Latin and Greek |
The rockets take astronauts and man-made satellites into space. The satellites are used for communication, weather monitoring and research. But how do satellites stay up without falling down?
There are two opposite forces (力量) acting on the satellite. One of them is the force of gravitation (地心引力), which tries to pull the satellite towards the earth. The other force is created by the rotation (旋转) of the satellite around the earth. This force tries to take the satellite away from the earth. With these two forces, the satellite goes round and round. The gravitational pull of the earth (the force which pulls everything towards the ground) is like a rope which keeps the satellite from flying away.
Everything that goes up has to come down. It is only a matter of time before a satellite comes back to the earth. As time goes by, the satellite loses its speed, which makes the gravitational pull stronger than the force pulling it away. This makes the satellite crash (坠落) down to the earth.
小题1:Which of the following uses of satellites is NOT mentioned?
| A．communication |
| B．monitoring the weather condition |
| C．doing some research |
| D．taking pictures |
| A．the earth |
| B．the satellite itself |
| C．the rotation of the satellite |
| D．the rope |
| A．Because of the force from the earth. |
| B．Because the satellite is too big. |
| C．Because of the force created by the rotation of the satellite around the earth. |
| D．Because people on earth have made ropes to tie the satellites tightly. |
| A．when it flies faster |
| B．when its speed slows down |
| C．when people cut the rope |
| D．when there is no electricity in it |
| A．There are four forces acting on the satellite. |
| B．The force of gravitation makes the satellite go round and round. |
| C．As time goes by, the satellite will finally fall down. |
| D．The satellite will stay in space forever. |
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