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

Thousands of villages in the developing world have no telephones. They have no money to build telephone systems. A new kind of technology may help change this situation. I t reduces the cost of building and using telephone systems.
Traditional systems use wires to carry electrical signals from one telephone to another. The wires often cost much more than telephones. The new system is based on radio communication. Each telephone sends and receives signals through the air, but not through the wires. This reduces the cost greatly. The radio telephone gets their power from the sun.
Each is connected to a solar equipment that changes the sun’s energy into electricity. A battery stores the electricity until someone needs to make or receive a call. The telephone turns off by itself if the level of power in the battery falls too low. This prevents damage to the system. Each radio telephone is connected to a computer microprocessor. It rewards how many calls are sent and received. It controls the power supply.
The technology needs more study, but its new use of radio equipment sun power and computers may help start telephone ringing in the other parts of the world.
68. The radio telephone gets their power from_____.
A. the sun 　　　B. electricity 　　　C. battery 　　　D. a special equipment
69. Each telephone is connected to_____.
A. a solar equipment 　　　　　　　B. a radio machine
C. a computer microprocessor 　　　D. Both A and C
70. From the passage we can infer that_____.
A. the new telephone system costs less than before
B. we can not use the radio as before
C. the new telephone system will take the place of the old one
D. it will be much easier to radio from now on
71. The main idea of the passage is_____.
A. a simple telephone system has been invented and costs less money
B. thousands of villages will use the new telephone system very soon
C. traditional telephone system will become useless
D. the new system will be too good to use

根据下列各句句意和空白之后的汉语提示词，在答题卷指定区域的横线上写出对应单词的正确形式，每空只写一词。

1.Sally was ___（收养）when he was four.

2.She felt　　（羞愧的）of doing that and tears ran down her cheeks.

3.In 1980, John Lennon was ___(射中) dead in New York.

4.She ______（扫视） shyly at him.

5.She's _____（上了瘾的）to video games, which makes her mother angry at times.

6.The sun sends out light and_____(温暖).

7.You can never_____(预测)what would happen next.

8.The ____(平均的) number of visitors amounts to 120,000.

9.“It looks awful,”she said ____(焦急地).

10.I wanted very much to get a new ____(一套衣服) and drop off the rags.

Thousands of villages in the developing world have no telephones. They have no money to build telephone systems. A new kind of technology may help change this situation. I t reduces the cost of building and using telephone systems.

Traditional systems use wires to carry electrical signals from one telephone to another. The wires often cost much more than telephones. The new system is based on radio communication. Each telephone sends and receives signals through the air, but not through the wires. This reduces the cost greatly. The radio telephone gets their power from the sun.

Each is connected to a solar equipment that changes the sun’s energy into electricity. A battery stores the electricity until someone needs to make or receive a call. The telephone turns off by itself if the level of power in the battery falls too low. This prevents damage to the system. Each radio telephone is connected to a computer microprocessor. It rewards how many calls are sent and received. It controls the power supply.

The technology needs more study, but its new use of radio equipment sun power and computers may help start telephone ringing in the other parts of the world.

68. The radio telephone gets their power from_____.

A. the sun 　　　B. electricity 　　　C. battery 　　　D. a special equipment

69. Each telephone is connected to_____.

A. a solar equipment 　　　　　　　B. a radio machine

C. a computer microprocessor 　　　D. Both A and C

70. From the passage we can infer that_____.

A. the new telephone system costs less than before

B. we can not use the radio as before

C. the new telephone system will take the place of the old one

D. it will be much easier to radio from now on

71. The main idea of the passage is_____.

A. a simple telephone system has been invented and costs less money

B. thousands of villages will use the new telephone system very soon

C. traditional telephone system will become useless

D. the new system will be too good to use

A Japanese toy maker declares that they have developed a gadget that translates dog barks into human language and plans to begin selling the gadget——under the name of Bowlingual——in U. S. pet stores and gift shops this summer.
Tokyo-based Takara Co. Ltd. says about 300, 000 of the dog translator gadgets have been sold since it was on sale in Japan late last year. It is forecasting far bigger sales once an English language translation for dogs comes to America in August. The United States is home to about 67 million dogs, more than six times the number in Japan.
"We know that the Americans love their dogs so much, so we don't think they will mind spending $ 120 on this product, " the Takara marketing manager said during an interview at a recent pet products conference in Atlanta.
Regarded as one of the coolest inventions of 2002 by Time magazine, Bowlingual is made up of a 3 - inch long wireless microphone that is fastened to a dog collar and sends out sounds to a small console (控制台) that is connected to a database (数据库). The console divides each bark into six emotional types——happiness, sadness, disappointment, anger, threat and desire——and shows common phrases, such as "You're ticking me off," that fit the dog's emotional state.
Takara says it has spent millions of dollars developing the gadget in cooperation（合作）with famous sound experts and animal behaviorists.
One thing that does appear certain is that the markets for animal translation products will likely remain a dog's world since Takara has no plans to develop a similar gadget for cats. "They are too unpredictable (反复无常) , " the marketing manager said.
【小题1】This passage mainly tells us that Bowlingual ___________.