The rockets take astronauts and man-made satellites into space. The satellites a

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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

小题2:The force that pulls the satellite towards the earth is created by ________.

A．the earth

B．the satellite itself

C．the rotation of the satellite

D．the rope

小题3:Why can’t the satellites fly away?

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.

小题4:The satellite will finally crashes down to the earth ________.

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

小题5:Which of the following is TRUE according to the passage?

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.

答案

小题1:D
小题2:A
小题3:A
小题4:B
小题5:C

解析

短文属于说明文。介绍了人造卫星不会坠落的原理。
小题1:细节理解题。从第一段第二句“…are used for communication, weather monitoring and research.”可知没提到D项。
小题2:推理判断题。从第二段最后一句“The gravitational pull of the earth”可知地心引力来自于地球。
小题3:综合理解题。从第二段第二句“…tries to pull the satellite towards the earth”和最后一句“…keeps the satellite from flying away”可知：是因为地心引力。
小题4:细节理解题。从短文后两句“…loses its speed…crash down to the earth”可知。
小题5:综合理解题。通读全文，可知A、B、D三项不符合文意；C项与短文最后一段吻合。

举一反三

Soccer is one of the most popular sports in our modern world. But many years ago, each country had its own kind of soccer game with its own hales.
In 1863, a group 0f people met in England. They made some changes (改变) to the game. They made one set of new rules for every country to follow. After that, soccer teams from different countries could play against each other.
Some of the rules are still the same today.
Now teams from all over the world take part in the World Cup every four years. It" s one of the most important things for all soccer fans.
小题1:Soccer is the only popular sport in our modem world.
小题2:After 1863, soccer teams from different countries could play against each other.
小题3:Today, the World Cup is one of the most important things for all soccer fans in the world.
小题4:The topic of this article is about the World Cup.

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Carbon monoxide poisoning (一氧化碳中毒) causes death and injuries around the world. This gas is a problem in all parts of the world that experience cold weather. A few years ago, America’s Centers for Disease Control (C. D. C.) studied deaths linked (联系) with carbon monoxide poisoning. It found that the number of carbon monoxide deaths in the United States was greatest in January. The C.D.C. also found that carbon monoxide kills more than four hundred Americans each year. And, it said more than twenty thousand people are taken to hospital for treatment of health problems linked with the gas.
Carbon monoxide is called the silent killer because people do not know it is in the air. The gas has no color, no taste and no smell. It does not cause burning eyes. And it does not cause people to cough. Yet, carbon monoxide gas is very deadly (致命的). It steals the body’s ability to use oxygen.
Carbon monoxide makes it difficult for the blood to carry oxygen to body tissues (血管). It does this by linking with the blood. When the gas links with the blood, the blood is no longer able to carry oxygen to the tissues that need it. Damage (损害) to the body can begin very quickly from large amounts (数量) of carbon monoxide.
How quickly this can happen depend on how long a person is breathing the gas and how much gas he or she breathes in.
Carbon monoxide poisoning has warning signs(标志). But people have to be awake to realize them. Small amounts of the gas will cause a person’s head to hurt. He or she may begin to feel tired. Their stomachs may feel sick. The room may appear to be turning around. The person may have trouble thinking clearly.
People develop serious headache as the amount of the gas continues to enter their blood. They will begin to feel very tired and sleepy. They may have terrible stomachache.
Doctors say carbon monoxide influences people differently. For example a small child will experience health problems or die much sooner than an adult. The general health of the person or his or her age can also be important.
小题1:The damage of carbon monoxide to the body has something to do with _____.

A．the amount a person breathes in

B．whether a person is healthy

C．how many signs a person finds

D．ages of people

小题2:One of the signs of carbon monoxide poisoning is _____.

A．burning eyes	B．bad cough
C．serious headache	D．high fever

小题3:Which of the following is TRUE according to the passage?

A．Carbon monoxide poisoning seldom happens in cold areas.

B．Twenty thousand Americans are killed by carbon monoxide each year.

C．Most people know whether there is carbon monoxide in the air.

D．Carbon monoxide stops the blood from carrying oxygen to body tissues.

小题4:What does the passage mainly talk about?

A．Warning signs that carbon monoxide poisoning has.

B．Reasons why carbon monoxide can cause person’s death.

C．The damage of carbon monoxide and how it works.

D．Influences of carbon monoxide on children and adults.

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Snack time is a part of the day for children of all ages. But new research suggests that kids snacking in big groups could be at risk for obesity.
Scientists from American University looked at the eating behavior of 54 kids between the ages of 2 and 6. At snack time, the scientist watched the amount of food each child ate while they were in groups of either three or nine. According to the study, the more children there are in a group, the more likely they are to eat more. Those in the larger group ate nearly 30 percent more than those in the smaller group, and they actually ate faster.
Since this is the first such study in children, scientists are quick to point out the importance of encouraging healthy habits in kids as early as possible.
“If you know kids eat more in large groups, it seems perfect to use this information to keep snack groups small or use small tables,” says Dr. Jana Klauer, an expert in New York.
Smaller groups would allow for a quiet and more relaxing environment-a perfect chance to teach children about food, manners and how to know when they feel full. “This would have an effect on kids" eating,” adds Klauer. “They would slow down and eat less.”
小题1:How many times have the scientists done such study according to the passage?

A．Once

B．Twice

C．Three times

D．Many times

小题2:The underlined word means” ”in Chinese.

A．健康

B．肥胖

C．瘦弱

D．服从

小题3:Why do children in smaller groups lose weight?

A．Because children in smaller groups eat faster.

B．Because children in smaller groups don"t like eating.

C．Because children in smaller groups don"t know about food.

D．Because children in smaller groups eat slowly and eat less.

小题4:The best title of the passage is “ ”

A．Snack Time	B．Different Groups
C．Eating More	D．Food for Kids

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Can you imagine a world without the Internet? It’s surprising to think about it.
Now, China has more than 162 million Internet users, according to the China Internet Network Information Centre. This is the second highest number of user in the world after the United States. Today, 66%of Chinese “netizens （网民）” are teenagers. “They spend about thirteen hours every week online,” said Qian Hulin, an Internet expert(专家). Doctor Song in Beijing Xuanwu Hospital said about 14% of Chinese netizens who are teens often lasted over ten hours to play online games.
The main reasons why teenagers surf the Web are to search for information, to communicate with others and to have fun. On the Internet, teenagers can find out almost anything. And surfing the Web can help students with their homework and widen their knowledge.
Li Dong, a teacher at No. 41 Middle School in Shijiazhuang, likes her students to use the Internet. “When we talk in class, students who surf the Net usually know more background information than the others,” she said.
In addition, people can use the Internet to write letters or stories and send e-mails. Many teens keep in touch with their friends online. It is cheaper than phoning somebody far away and also much quicker.
小题1:_______ has the most Internet users in the world according to the article.

A．China

B．America

C．Canada

D．Russia

小题2:There are about _______ Chinese netizens to surf about 13 hours every week.

A．107 million old	B．22.7 million old
C．107 million young	D．22.7 million young

小题3:Song said some teenagers continued _______ more than ten hours.

A．playing online games

B．searching for information

C．chatting with their friends

D．sending e-mails to others

小题4:Li Dong in No. 41 Middle School likes her students to use the Internet because she
______.

A．thinks surfing the net can help students spend less time on homework

B．thinks her students can get more background information than the others

C．wants her students to talk to her about their hobbies and interests

D．wants to know what her students do and think about at home

小题5:Which way is the cheapest and quickest to learn something about friends far away?

A．Giving them a call.

B．Going to see them.

C．Writing a letter to them.

D．Sending e-mails to them.

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Rivers are one of our most important natural resources(资源). Many of the world’s great cities are located on rivers, and almost every country has at least one river running through it that plays an important part in the lives of its people.
Since the beginning of history, people have used rivers for transportation. The longest one in the United States is the Mississippi. The lifeline of Egypt is the Nile. To the people of India, the Ganges is great, but it is also important for transportation; ships can travel along it for a thousand miles. Other great rivers are the Congo in Africa and the Mekong in southeastern Asia. The greatest of all for navigation（航海）, however, is the Amazon in Brazil（巴西）. It is so wide and so deep that large ships can go about two thousand miles up it.
Besides transportation, rivers give food to eat, water to drink, water for crops, and chances for fun. In order to increase the supply(供给) of water for crops, engineers sometimes build a dam (大坝)across a river and let a lake form behind the dam. Then people can use the water not only to irrigate(灌溉) their fields but also to make electricity for their homes and industries.
However, large cities and industries that are located on rivers often cause problems. As the cities grow in size and industries increase in number, the water in the rivers becomes polluted with chemicals and other materials. People are learning the importance, however, of doing more to keep their rivers clean if they want to enjoy the benefits of these natural resources.
小题1:The greatest river for navigation is ________________.

A．the Mississippi	B．the Nile
C．the Mekong	D．the Amazon

小题2:Which is NOT true according to the passage?

A．Many cities are located on rivers.

B．Almost every country has at least one important river.

C．The Nile is in India.

D．Rivers play an important part in the lives of people.

小题3:When rivers are dammed, people use the water for __________.

A．keeping the rivers clean

B．making electricity

C．washing clothes

D．irrigation and the production of electricity

小题4:Most water in rivers is polluted with ___________.

A．people’s drinking water too much

B．people’s swimming in the river too much

C．chemicals and other materials

D．people’s building a dam across a river

小题5:The best title for the passage is _____________.

A．The Importance of Rivers	B．Rivers in Cities
C．Transportation	D．Natural Resources

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