Our surroundings are being polluted faster than nature and man’s present efforts cannot prevent it. Time is bringing us more people, and more people will bring us more industry, more cars, larger cities, and the growing use of man-made materials.

What can explain and solve this problem? The fact is that pollution is caused by man — by his desire for a modern way of life. We make “increasing industrialization” our chief aim. So we are often ready to offer everything: clean air, pure water, good food, our health and the future of our children. There is a constant flow of people from the countryside into the cities, eager for the benefits of our modern society. But as our technological achievements have grown in the last twenty years, pollution has become a serious problem.

Isn’t it time we stopped to ask ourselves where we are going — and why? It makes one think of the story about the airline pilot who told his passengers over the loudspeaker, “I’ve some good news and some bad news. The good news is that we’re making rapid progress at 530 miles per hour. The bad news is that we’re lost and don’t know where we’re going.” The sad fact is that this becomes a true story when spoken of our modern society.

Man cannot prevent the world from being polluted mainly because ______.

   A. the population of the world is decreasing fast 

   B. people use too many man-made materials

   C. we have more and more industry  

   D. we are producing more cars, trucks and buses

People crowd into the cities because ______.

　 A. they want very much to find well-paid jobs

　 B. they are anxious to enjoy the achievements of our society

   C. they have become tired of their homeland

   D. they have a strong wish to become industrial workers

According to the passage, what does man value most?

   A. Industry.                                       B. Health.   

   C. Clean air.                                 D. The future of the children.

The story about the airline pilot tells us that ______.

   A. man knows where the society is going

   B. people do not welcome the rapid development of modern society

   C. man can do little about the problem of pollution

   D. the writer is worried about the future of our society

What does the writer really want to say in this passage?

   A. With the development of technology, pollution has become a serious problem.

   B. Lower the speed of development to stop pollution.

   C. It’s time we did something to reduce pollution.

   D. As industry is growing fast, pollution is the natural result.

  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 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 sky. 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 65 or 75 times a minute. Your heart is a pump 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.

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. People of different ages are interested in different things.　 

   D. Men and women are curious about different things.

Scientists who work with the biological sciences study____.

   A. the earth , the oceans and the sky    B. plants and animals

   C. man-made things                 D. ocean water

A rock cracks _____.

   A. in wet regions                   B. in dry regions

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

People are always curious because _____ .

A. they know little about the world     B. they know nothing about the world

C. they can not explain many things     D. they want to be scientists

Word came that the government must control the spread of this disease.

“Our job，”said the　26　officer，“is to spray the wall of every house in every town and village in the malaria parts of Mexico.You may be　27　to learn that there are about ninety-nine thousand　28　villages and towns.Some are big places like the capital city，　29　are single houses deep in the forest or upon the mountaintops.The men working with our program say that most of these people　30　within districts which are　31　enough for the mala ria-carrying mosquitoes to live in and spread the disease.That　32　that we must plan to spray the bricks of　33　three million houses once or twice a year for five years.”

“We have　34　everything very carefully，”said the officer　35　.“Our advance guards have drawn　36　of some forty thousand parts of the country for　37　by the spray teams.Each house in the malaria districts has been given a special　38　so that we can work in order.The United States has given us cars and trucks to carry the spray teams and their　39　.”

“The malaria program has been　40　with the people in this country.Everyone wants to　41　.The Defense Department is helping us plan the　42　of men and supplies.The Education Department has printed sheets in Spanish to explain　43　malaria is spread.Resistance is a problem.It was in the neighboring country—the United States that such resistance to spray was first　44　.Take the　45　of the housefly and D.D.T. At fist D.D.T. killed them off.Now it won’t hurt a fly.”

“What worries people is the danger that the mosquitoes may become resistant，”said the officer at last.

26.A.education              B.wealth                       C.health                       D.medicine

27.A.surprised                     B.excited                      C.doubtful                    D.happy

28.A.united                  B.developing                C.similar                      D.separate

29.A.other                    B.some                         C.the others                  D.the few

30.A.sleep                    B.live                           C.stand                         D.sit

31.A.cold                            B.hot                           C.bright                       D.warm

32.A.saves                    B.expresses                   C.means                       D.is

33.A.nearly                  B.mostly                      C.finally                       D.only

34.A.read                            B.learnt                        C.written                      D.studied

35.A.mentioned            B.remembered                     C.started                       D.continued

36.A.pictures                B.places                       C.maps                         D.bus-lines

37.A.store                    B.use                           C.share                         D.show

38.A.name                    B.sign                          C.number                            D.attention

39.A.tools                    B.clothes                      C.families                     D.guns

40.A.familiar                B.friendly                     C.strict                         D.popular

41.A.work                    B.run                           C.stop                          D.help

42.A.movement            B.program                    C.action                       D.equipment

43.A.why                            B.how                          C.what                         D.that

44.A.proved                 B.killed                        C.thought                            D.discussed

45.A.event                    B.matter                       C.fact                           D.case

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.

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

　 A．People of different ages are interested in different things

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

　 C．Men and women are curious about different things.

　 D．People are curious in the same way.

2.Scientists who work with the biological sciences study____.

    A．the earth , the oceans and the sky   B．plants and animals

    C．man-made things              D．ocean water

3.When you run, your muscles need ____.

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

4.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

5.People are always curious because ____.

A．they cannot explain many things     B．they know nothing about the world

C．they know little about the world                             D．they want to be scientists

It is natural that children are curious (好奇的) 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.

1.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

2.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

3.When you run, your muscles need ____.

A．more nutrition and oxygen    B．more signals   

C．more salt                  D．water

4.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

5.People are always curious because ____.

A．they cannot explain many things  B．they know nothing about the world

C．they know little about the world  D．they want to be scientists