B

It is natural that children are curious about the world around them. For example, they want to know how their hearts beat. They want to know why the ocean water tastes salty.

　　As children grow up, they become curious about different kinds of things. When they are babies, they are interested in the parts of their bodies and in the smiles of their mothers. They become interested in the physical world around them: the plants, the animals, the sky. Later, they become interested in the things that people have made: wheels, bicycles, cars. And when they are adults, their curiosity continues. Sometimes this curiosity leads to a career (生涯、职业) in science.

　　Scientists spend their lives trying to find out about the world．Those who work with the earth sciences study the earth, the oceans, and the skies. Other scientists who study living things work with the biological sciences. A third group of scientists study the physical sciences, e. g. physics, chemistry .

　　These scientists have already discovered a lot about our world．For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy-five times a minute. Your heart is a pump (泵) that pumps blood to all parts of the body. The blood carries oxygen and nutrition. When you run, your muscles work very hard and use the nutrition that the blood carries to them. The muscles need oxygen, too . So your brain sends a signal to the heart. The signal means that the muscles need more nutrition and oxygen. Then the heart beats fast and sends blood quickly to the muscles. It may beat 90 to 140 times a minute.

　　Of course, scientists cannot answer all of our questions. If we ask, “Why does the ocean water taste salty” scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask , “What happens to the salt in the ocean? The ocean does not get saltier every year.” Scientists are not sure about the answer to this question.

　　We know a lot about our world, but there are still many answers that we do not have, and we are curious.

45．According to the passage, which of the following statements is true?

　  A．People are curious in the same way.

　  B．People in different countries are interested in different things.

　  C．Men and women are curious about different things.

　  D．People of different ages are interested in different things

46．Scientists who work with the biological sciences study____.

A．the earth , the oceans and the sky          B．man-made things

C．plants and animals                               D．ocean water

47．When you run, your muscles need ____.

A．more nutrition and oxygen    B．more signals    C．more salt   D．water

48．A rock cracks _____.

A．in wet regions                                     B．in dry regions

C．at very high or very low temperatures               D．when salty water falls in

Below is a web page from Google.

When was the environmental symbol of Beijing Olympics made public?

A.On January 23,2005.

B.On September 24,2005.

C.On February 5,2007.

D.On March 11,2007.

Which of the following websites is designed for young researchers interested in the Olympics?

A.Environment

B.Green Olympics Forum In Beijing 2004

C.Olympic Games Quizzes and Olympic Games Trivia

D.OFFICIAL WEBSITE OF THE OLYMPIC MOVEMENT

Which website provides a complete list of the winners in the Olympic Games?

A.Olympic—Modern Olympic Games

B.Green Olympics Forum In Beijing 2004

C.Environmental Symbol of Beijing Olympics—‘Green Olympics’

D.Ancient Olympic Heritage and Modern Olympic Games in Athens 2004

What do we learn from the above web page?

A.Beijing has made efforts to improve its air quality.

B.The Olympic torch relay route has not been planned.

C.The Olympic flags will be on display in Athens.

D.A quiz on the Olympics will be held in Beijing.

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一．根据首字母或中文完成句子：

1.At the museum, visitors are requested not to touch the e_______________.

2.The government yesterday ____(宣布) to the media that they would create some new jobs.

3.The IT i___________ is playing an important role in the development of economy.

4.Though caught in a snowstorm, the pilot g _________ the plane to a safe landing.

5.Three fourths of the earth’s s ________ is covered with water, our earth is an ocean planet.

6.I feel really happy to be e _________ in this famous university to teach advanced English.

7.He was too ____________ (没经验) for the job. He worked here no more than three days .

8.Many young soldiers helped to r ___________ people from the fire of the hotel. One of them was killed and some were injured.

9.Some students in our class are worried about their p _______ and want many people to like them.

10.He suddenly experienced a f ____ of shame when his name was mentioned at the meeting.

11.My computer c ______ suddenly last night and all of my documents I was working on got lost.

12.The child was t __________ at the piano his parents sent to him on his birthday.

13.This machine is used to ___________ (监测) a patient’s pulse.

14.The decision was c ________ by all the members.

15.He seems to be honest and trusted, but in r ________ he often tells lies.

16.He has an e __________ talent for music.

17.I think that we have many o __________ of meeting interesting people on the train when traveling.

18.Matter has three states . For example, water is ___________(液体).

19.A number of parents have v _______ concern about their children’s safety.

20.She d ________ a talk on philosophy during her visit to her mother school.

All over the world people enjoy sports. Sports help to keep people healthy and happy, and to live longer.

  51   They buy tickets or turn on their TVs to watch the games. Often they get very excited when their player or team wins.

 52  Football, for example, has spread around the world. Swimming is popular in all countries near the sea or in those with many rivers. What fun it is to jump into a pool or lake, whether in China, Egypt or Italy!  53   Think how many lovers to skate or ski in winter in Japan, Norway or Canada.

Some sports or game go back thousands of years, like running or jumping. Chinese wushu, for example, has a very long history. But basketball and volleyball are rather new. Neither one is a hundred years old yet.  54  Water-skiing is one of the newest in the family of sports.

People from different countries may not be able to understand each other, but after a game together they often become good friends.  55    One learns to fight（奋斗） hard and fight fair(公平的), to win without pride and to lose with grace. (胜不骄败不馁)

E. People aren’t inventing new sports or games.

F. Some sports are so interesting that people everywhere take part in them.

G. People are inventing（发明） new sports or games all the time.

51 ______   52 ______   53 ______  54______  55______