题目内容
Each year Ben is glad when school is closed on Martin Luther King Jr. Day．Ben knows that this day honors an important man，but Ben does not feel connected to him．However，the small-world theory （理论） connects Ben to Dr. King．Ben's mom （0） has a close friend，Amy（1）．Amy’s uncle，Mark（2），once met and spoke to John Carter（3），the son of President Jimmy Carter（4）．Jimmy Carter knew Dr. King （5）． In a way，Ben is only “five people away” from Martin Luther King Jr．
The small-world theory says that everyone in the world is connected through a short chain （链条）of people they know．Another name of this chain is degrees of separation．Each degree is a step that separates a person from someone he or she does not know．There are zero degrees of separation between a person and the people he or she knows directly．This means that there are zero degrees between Ben and his mom．There is one degree of separation when just one person separates someone from a person he or she does not know．Ben knows his mom，but he hasn't met her close friend Amy．Therefore，Ben is one degree away from Amy．As the chain continues，Amy's uncle，Mark，is two degrees．John Carter is three degrees，and his father is four degrees．Dr. King is five degrees away from Ben．The theory says that there are no more than six degrees of separation between any two people in the world．
The small-world theory has a lot to do with math．The theory assumes（假定）that each person knows 100 people. Each one of those 100 people knows 50 different people．Each of those 50 people knows another 50 people，and so on．When someone continues the calculation to six degrees，it is like this：100 × 50 × 50 × 50 × 50 × 50 = 31.25 × 109．This number is greater than 31 billion（a billion = a thousand million）．There are over 6 billion people in the world．These numbers show it is possible that six degrees of separation could include everyone in the world．
Does the small-world theory work? No one has ever proved it．Maybe the theory just invites people to think a little more about their places in the world. ．
1．Ben is two degrees away from ．
A．Jimmy Carter B．John Carter C．Amy D．Mark
2．What is the meaning of "degrees of separation" in Paragraph 2?
A．The chain to connect people． B．The relations between people．
C．The steps of knowing strangers． D．The separation between strangers．
3．What is the small-world theory mainly about?
A．How far Ben is away from Dr. King． B．How many people one can get to know．
C．How people are connected in the world． D．How the degrees of separation are set up．
4．We can learn from the article that ．
A．the small-world theory works
B．more research is needed to prove the theory
C．six degrees are needed to know the strangers
D．the writer's purpose is to help people find out their places
1．D 2．A 3．C 4．B
口算题天天练系列答案Do you want to be successful in everything you do? If so, then how? Here is an example.
There was a farmer who 36 corn（玉米）all his life. Each year he took his corn to the market. Then each time his corn was chosen as the 37 and won the first prize.
One year a newspaper reporter interviewed him and learned something surprising about how he grew it. The farmer 38 his seed（做种子的) corn to his neighbors.
"How can you share your best seed corn with your neighbors?" the reporter asked. "You know they are taking part in the 39 with you each year."
"Why, sir," said the farmer, "didn't you know? The 40 picks up pollen (花粉) from the corn and moves it quickly from field to field. If my neighbors grow 41 corn, cross-pollination (异花传粉) will affect the quality of my corn. So if I want to grow good corn, I must help my neighbors to grow good corn. "
The farmer knows much about the connection of life. His corn cannot improve unless his neighbor's corn improves.
As a great man says, "We make a living by what we grow; we make a life by what we give." We can't 42 without food, clothes, and many other things. However, a meaningful life is not decided by how much we can get, 43 by how much we can give others. Giving, instead of taking, makes us 44 from other animals.
So those who choose to live well must help others to live well and those who choose to be happy must help others to find 45 in their life.
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Have you ever planted a few trees on Tree Planting Day? Each year, millions of people, both 41.______, plant a lot of trees. But this may not be the best way to make your home a 42._____ place.
Last week we visited a park in Hebei. We were 43._____ to find most of the trees had been burned. The workers told us that the trees 44._____ soon after they were planted because they weren’t watered well enough. 45._____ workers burned them and cleaned the place for 46._____ trees to be planted this year. 47.______ a card found in one of the dead trees, a student wrote,” I hope this tree will grow up with me to 48.______ the backbone (栋梁) of our country.” The workers said that the survival (存活) of the trees was really more important than 49.______ trees were planted.
Some people in Beijing now have a new idea that they can donate (捐赠) some money and let professional (专业人士) plant and 50.______ the trees.
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A habit is any action that we have performed so often that it becomes something we do almost without thinking. Some of them are thought to be bad habits. People spend countless hours and dollars each year trying to drop these bad habits but often fail. Why? Change is hard work and there is no shortcut to achieve it. However, there is still some advice for you to follow.
First, look at why you do it. In other words, what’s the result of doing this thing? If your bad habit is shouting at people when you are unhappy or under pressure, what do you get from it? It may make you feel a little better for the moment. Or maybe you have a bad habit of leaving your homework undone. The result could be that you get more time to spend on the Internet!
Next, take a look on the other hand. What are you losing because of your habit? Shouting at other people is a bad habit because it makes people around you feel bad and unhappy. Leaving your homework undone is a bad habit because you may be punished by your teacher. Having more Internet time means that you are losing the chance to learn the things that you need to learn. When you think that way, you’ll find that it’s not wise to keep your bad habit! Now it is time to make a decision. What will you choose? I’m sure you will choose to do what you think is more important.
【小题1】From the first paragraph we know that .
| A．people always fail to break bad habits |
| B．we must change all the habits we have |
| C．a habit is a terrible thing we can never change |
| D．it’s difficult, but we should do something about bad habits |
| A．it is not easy to give up bad habits | B．there is a long way and a short way |
| C．something dangerous may happen | D．we must cut bad habits in a short time |
| A．talk to others when you are in low spirits | B．know why you do what you do |
| C．finish your homework first | D．spend less time on the Internet |
| A．not to shout at people when we are sad | B．not to spend much time on the Internet |
| C．to give up our bad habits | D．to decide what to choose |
World Wildlife Fund (WWF)'s goal is to save the world's environment. The organization was set up ___21__September 11，1961. In the beginning, WWF worked __22__ the world's wildlife. Now, it works to save Earth__23___ its environment.
WWF has many tasks. One is to stop air pollution. Pollution from industry(工业) and cars is _24_ to our environment. Each year, more and more trees are cut down __25__WWF tries to protect Earth's forests．Also people use more land, more and more animals are __26__ their homes and many die. WWF can buy important areas to __27__ the land from disappearing because of human development.
WWF has completed many projects. In China, WWF works to save pandas from extinction（灭绝）． ___28__South America，it works to save the Amazon Rainforest. Volunteers and donations help WWF complete its work. WWF's work is __29__to our environment, and is also important for people to help them __30__ time and money.
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