Put an ice cube from your fridge into a glass of water. You have a piece of string(线) 10 centimeters long. The problem is to take out that piece of ice with the help of the string. But you must not to 题目和参考答案——青夏教育精英家教网——

题目内容

Put an ice cube from your fridge into a glass of water. You have a piece of string(线) 10 centimeters long. The problem is to take out that piece of ice with the help of the string. But you must not touch the ice with your fingers.
You may ask your friends to try to do that when you are having dinner together. There is a saltcellar on the table. You must use salt when you carry out this experiment.
First you put the string across the piece of ice. Then put some salt on the ice. Salt makes ice melt(融化). The ice round the string will begin to melt. But when it melts, it will lose heat. The cold ice cube will make the salt water freeze(结冰) again.
After a minute or two you may raise the piece of string and with it you will raise your piece of ice!
This experiment can be very useful to you. If, for example, there is ice near the door of your house, you must use very much salt to melt all the ice. If you don’t put enough salt, the water will freeze again.
小题1:We must use when we carry out this experiment.

A．a fridge

B．some food

C．a table

D．some salt

小题2:How long will it take to carry out this experiment?

A．More than three minutes.	B．Five minutes or two.
C．Only one minute or two.	D．About ten minutes.

小题3:We can learn something about from the passage.

A．physics

B．biology

C．chemistry

D．maths

小题1:D
小题2:C
小题3:C

试题分析：本文介绍了一个小实验，作者基本上是按照事情的发展顺序进行介绍，阅读中注意序数词的使用。
小题1:根据You must use salt when you carry out this experiment.可知选D。
小题2:根据After a minute or two you may raise the piece of string and with it you will raise your piece of ice!描述可知选C。
小题3:冰融化成水或者水结成冰属于化学变化，故从本文中学到的是化学知识。选C。
点评：本文浅显易懂，各个小题都能在文中找到适当依据。只要认真阅读短文，注意前后联系，就能顺利完成阅读。

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相关题目

Are you carrying too much on your back at school? I’m sure lots of children of your age will say “Yes”. Not only the students in China have this problem, but children in the United States also have heavy school bags.
Doctors are starting to worry about young students’ back and neck because their school bags are too heavy for them.
“It’s hard for me to go upstairs with my heavy bag,” said Rick Hammond, an ll-year-old student in the USA.
Rick is among students who have school bags with two straps(带子),and many other students choose rolling(有滚轮的) bags.
But even with rolling bags ,getting upstairs is still a problem for children .Doctors say students should carry no more than 10% to 15% of their own body weight (重量)。
Scott Bautch, a back doctor, said children under Grade 4 should carry no more than 10% of their weight and older children shouldn’t stay with over 15% , because their bodies are still growing.
Teachers and parents should do some things to help children. And the best answer is to have less homework!
小题1:From the passage we cam know that .

A．only children in China carry too heavy school bags.

B．children in other countries don’t carry too heavy bags.

C．both children in China and the USA carry too heavy school bags.

D．only children in the USA carry too heavy school bags.

小题2:Children feel it hard for them to go upstairs because .

A．they are too young.

B．their school bags are too heavy.

C．they are too heavy.

D．their parents don’t always go upstairs with them.

小题3:If a child carries a heavy school bag, .

A．his back and neck may be hurt.

B．his head and arms may be hurt .

C．his hands may be hurt .

D．his feet may be hurt .

小题4:According to the doctor, Scott Bautch, if a child in Grade 5 weighs about 30 kilos, the school bag he carries should not be over .

小题5:Some students think the best answer to this problem is that .

A．they should have a little homework to do after they get home

B．their teachers had getter not ask them to do any homework

C．they should only take home the books they will read that night.

D．They should use thin books instead of thick ones.

Once a baby cries, the parents will go to see what happened as soon as possible. According to a new study, a baby’s cry can make adults react very quickly, even if they are not related(相关的).
Oxford University researchers used a game called Whack-a-mole for the study. The game needs people to hit one buttons(按钮). The players must react as quickly as they can to hit the button that lights up at random(随机的). It is a game that requires speed and accuracy(准确度).
The study included 40 men and women volunteers aged 19 to 59. Some of them had sons or daughters but none had a baby at the time. They played whack-a-mole after listening to different sounds, including babies’ crying, the crying of adults in trouble and birds’ song that sounds like babies’ crying.
The volunteer’ scores were higher after listening to the sound of crying babies. Men and women had similar scores. The results showed that a crying baby gets special attention.
“Few sounds make people react quite like the cry of a baby,” said Morten Kringelbach of Oxford’s psychiatry department, who led the study.
He added that a baby’s cry can increase adults’ heart rate and blood pressure. This is understandable, because in the course of human evolution(进化), taking care of babies has always been an important job for adults. When a baby is hungry or feeling bored or unwell, it will cry. As a result, human brains and bodies develop a special reaction to a baby’s cry.
小题1:According to the passage, how many volunteers took part in the study?

小题2:In the passage, the underlined word react means__________.

小题3:The game “whack-a-mole” shows__________.

A．a baby’s cry can get special attention from adults

B．men and women have different reaction speed and accuracy

C．adults without babies react more quickly to a baby’s cry

D．women react to a baby’s cry more quickly than men

小题4:According to the passage, a baby’s cry__________.

A．can get the same attention from adults as the birds’ song

B．is the noisiest sound

C．can increase adults’ heart rate and blood pressure

D．is good for its health

小题5:From the last paragraph, we learn that_________.

A．taking care of the younger babies was the most important thing in the past

B．human brains and bodies have developed to take care of babies

C．baby cries are a good way make adults react quickly

D．baby cries have developed a lot during the course of human evolution

Can plants eat people? Probably not, but there are many plants that eat meat. Some of them are big. And they can eat small animals. One famous meat-eating plant is the Venus flytrap(捕蝇草).
The Venus flytrap is a very strange plant. It grows in dry parts of the United States. Its leaves are like the pages of a book. They can open and close very quickly. Inside the leaves, there are three small hairs. If a fly touches one of the hairs, the leaf closes quickly. The fly cannot get out. In about half an hour, the leaf presses the fly until it is dead. Then, the plant covers the fly. Slowly, the plant eats the fly.
Why do plants do it? Most plants get what they need from the sun, the air, and the ground. In some places, the ground is very poor. It doesn't have all these important things, especially nitrogen(氮). Animal meat has a lot of nitrogen, so some plants eat meat to get what they need. Let's hope that some of the bigger plants don't get the same idea!
小题1:The Venus flytrap is a kind of _________.

小题2:The underlined word "presses" probably means _________ in Chinese．

小题3:Why do some plants eat animal meat?

A．Because plants are dangerous to animals.

B．Because animals are dangerous to plants.

C．Because plants want to get what they need from animal meat.

D．Because plants want to protect themselves against animals.

A man came back home from work late, he was tired And he was surprised to find his ten-year-old son waiting for him at the door.
"Daddy, how much money do you make an hour?"
"If you want to know, I make $20 an hour."
"Oh,"the little boy answered, with his head down. He thought for a moment, looked up and said, “Daddy, could you lend me $10?"
The father was furious, "If you asked for money to buy a toy or some other rubbish, then go straight to your room and think why you are being so selfish !"
The little boy quietly went to his room and closed the door. After about an hour, the father calmed down, and started to think, "Maybe he really needs to buy something and he didn’t ask for money very often."So he went to the little boy’s room.
"Sorry! Maybe I was too hard on you just now," said the man. "Here’s $10."
"Oh, thank you, Daddy!"the boy said happily. Then, the boy took out some coins. When the father found that the boy already had some money, he got angry again.
"Why do you want more money after you already have some?" the father shouted angrily.
"Because I didn’t have enough, but now I do," the little boy answered, "Daddy, I have $20 now. Can I buy an hour of your time? Please come home early tomorrow. I would like to have dinner with you."
小题1:How much does the man make if he works an hour?

小题2:In this passage, the underlined word "furious" means ______.

B．quite happy

C．too excited

D．a little nervous

小题3:At first, the father didn’t give her son any money because______.

A．he thought the boy wanted to keep the money for himself

B．he did not have enough money at that moment

C．he thought the boy would buy something of no use

D．the boy always borrowed money from him

小题4:The boy wanted to buy ______with twenty dollars.

A．a new book for himself	B．a nice present for his father
C．a toy for his own birthday	D．an hour of his father’s time

小题5:From this passage, we can infer that the boy's father______.

A．often played with his son	B．spent little time with his son
C．didn’t love his son at all	D．often came back home early

Concorde’s Birthday
CONCORDE, the world’s fastest passenger plane, will soon be over 33 years old. It first __1__ on 2 March 1969 in France. Concorde was developed by both France and Britain. From 1956 these two countries had a _2__ of a supersonic passenger plane. In 1962 they started to __3__ together on the project. The plane __4_ over 1.5 billion pounds to develop. It is the most tested plane in the history. It was given over 5000 hours of testing. Concorde flies at twice the speed of _5__. This means that it _6_ only 3 hours 25 minutes to fly between London and New York, compare with 7—8 hours in other passenger jets. Because of the five-hour time difference between the USA and Britain, it is _7__ to travel west on Concorde and arrive in New York before you leave London! You can catch the 10:30a.m. _8__ from London, Heathrow and start work in New York an hour _9_! Concorde is much used by business people and film stars. Each Concorde is built at a cost of 55 million pounds. Twenty have been built so far. Air France and British Airway _10_ the most. They each have seven planes.

完形填空：（一）（本题共10小题；每小题1分，满分10分）
阅读下面短文，掌握其大意，然后从每题所给的四个选项中，选出最佳项填入文中空白处。
Computer games are very popular. It is natural for people to want to _1___ , so playing against a computer or against a friend on the computer can be __2__to stop. “ Just one more game, ” often turns into another game, then another.
Computer games do have their _3__. They are excellent for training hand or eye coordination(协调).Surgeons (外科医生)_4____played computer games as children are often skilled. Computer games can __5__ be great for teaching students. The students are open to learning while playing. They can study for longer than a teacher would be able to teach.
But like anything __6__ in life, things should be balanced.(平衡).Too much time on the computer can _7__ your eyes. Regular breaks are needed. If students cannot _8__ playing computer games, they won’t do as well in other areas in their life—not just schoolwork, but in developing important social skill such as how to talk with people and how to work with others. And if they are no longer taking regular exercise, __9___ health will become worse.
Computer games have their place, __10___people must also remember it is important to have a balanced lifestyle.

B．suggestions

Doctor Seuss was born in 1904. By the middle 1950s, he had become one of the best-loved and most successful children's book writers in the world. His books are very popular with young readers. They enjoy the invented words and the pictures of unusual funny animals and plants.
In 1954, life magazine published a report about school children who could not read well. The report said many children's books were not interesting. Doctor Seuss strongly hoped to help children and decided to write books that were interesting and easy to read. He used words with the same ending sound, like fish and wish. He did not receive training in art. Yet, he drew the pictures for most of his books.
In 1957, Dr. Seuss wrote The Cat in the Hat. He used less than 230 words to write the book and even a six-year-old should be able to read it. It was a fun story and easy to read. Children loved it. Their parents loved it, too. Today it is still one of the stories they like best. The success of The Cat in the Hat made him want to write more books for children. In 1960, he wrote a book using less than fifty words. The book is called Green Eggs and Ham.
In 1984, Doctor Seuss won a Pulitzer Prize. He was honored for the education and enjoyment his books provided American children and their parents.
He died at the age of 87, but his influence remains. Millions of his books have been sold worldwide. People say his books helped change the way American children learned to read. Yet, his books are loved by people of all ages. Doctor Seuss once said, "I do not write for children. I write for people.
小题1:Doctor Seuss learned from the magazine that _______.

A．some school children could not read well

B．many children's books were interesting

C．children wanted to learn to write

D．a writer for children was wanted

小题2: People like his books because the books ______.

A．are cheap and easy to get

B．were written in different languages

C．are easy and interesting to read

D．were written with invented words

小题3:He wrote the book The Cat in the Hat at the age of _____.

小题4:Which of the following is TRUE according to the passage?

A．Doctor Seuss wrote Green Eggs and Ham with over 230 words.

B．Doctor Seuss wrote books only for children in the United States.

C．The Cat in the Hat was written only for six-year-old children.

D．His books provided education and enjoyment for Americans.

小题5: From the text we know that Doctor Seuss __________.

A．won a Pulitzer Prize soon after his death

B．sold millions of his books himself worldwide

C．changed American children's way of reading

D．wrote the largest number of books in the world

The task(任务)of students is to study．But studying __21__a right way, or we will waste(浪费)time or __22__．The following are some ways of studying .The best time for reading is in the morning ,___23__ in the morning the air is fresh and the mind is clear．
__24__studying,we must have patience(耐心).If we have not __25__ a text well，we must read it again.We should not read the next one until we have learnt the first one．
When we are __26__，we must put our hearts into the book，or we can get __27__ from the book that we are reading
We must always __28__“why” If we can’t understand something well，write it down and ask our teachers，parents or friends
Though there are many __29__of studying，the above will be quite enough if we can __30__them in heart and do so.

小题9:A. ways B skills C. articles D .chances