48. The author holds different opinions from other people in that ____.

　 A. young people nowadays do not like the adult world　

B .young people in Britain today are freer than before　

C .young people who commit crimes are greatly affected by the films of violence and crimes　

D. young people living in small villages in Britain commit fewer crimes than those in big cities.

47. According to the passage, which groups of the following young people from British are least likely to commit crimes?

　 A. Those in big cities　　　 B .Those in the countryside　

C .those who are very poor　 D .those who are in urgent need of help.

46. From the passage we know that many British people at the present time are puzzled about ____.

A. the causes of young people’s crimes　

B. the increase of the crime rate　

C. the problems of crime in the country　

D . the various kinds of juvenile crimes.

45. The paragraph following the passage will probably discuss which of the following?

　 A. The remaining layers of the sun　 B. The development of the present form　 C .The rays from other planets D. The outer starts of the universe,

C

　 Crime is a very serious problem in Britain. One sort of crime which particularly worries people is juvenile crimes - that is, crimes committed by young people. For some years juvenile crimes have been increasing. There are two main sorts of juvenile crimes: stealing and violence. Most people do not understand why young people commit these crimes. There are , I think, a large number of different reasons.

　 These crimes are not usually committed by people who are poor or in need. Young people often dislike and hate the adult world. They will do things to show that they are rebels. Also in Britain today it is easier for young people to commit crimes because they have more freedom to go where they like and more money to do what they like.

　 There are two other possible causes which are worth mentioning. More and more people in Britain live in large towns. In a large town no one knows who anyone else is or where they live. But in the village I come from crimes are rare because everybody knows everyone else.

　 Although it is difficult to explain, I think the last cause is very important. Perhaps there is something with our society which encourages violence and crime. It is a fact that all the time children are exposed to films and reports about crimes. Many people do not agree that this affects the young people, but I think that young people are very much affected by the society they grow up in. I feel that the fault may be as much with our whole society as with these young people.

44. According to the passage, as the corona rays reach the planets, they become ____.

　 A. clearer　 B. cooler　 C. weaker　 D .darker

43. All of the following are parts of the sun’s atmosphere except the ____.

　 A. photosphere　 B. corona　 C. chromosphere　 D. convection zone

42. With what topic is the passage mainly concerned?

　 A. How the sun developed　　　　　 B. The layers of the sun　

C. The high temperature of the sun　　 D. The great pressures of the sun

41. There may be a solid core at the center of the sun ____.

　 A because of the high temperature　　　　　 B .in spite of the great pressures　

C. for the temperature is not high enough　　 D .because the pressures are great.

40. To tell the difference between a common issue and a rare variety, a collector needs ____.

　 A. much knowledge of history　

B. more knowledge of history　

C. more knowledge than what appears on stamps　

D. techniques to use a magnifying glass

B

　 The temperature of the sun is over 5,000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees at the center. The sun is so much hotter than the earth that matter can exist only as a gas, except at the core, that is, the center. In the core of the sun, the pressures are so great against the gases that, in spite of the high temperature, there may be a small solid core. However, no one really knows, since the center of the sun can never be directly observed.

　 Scientists do know that the sun is divided into five layers. Staring at the outside and going down into the sun, the layers are the corona, chromosphere, photosphere, convection zone, and finally the core. The first three layers are regarded as the sun’s atmosphere. But since the sun has no solid surface, it is hard to tell where the atmosphere ends and the body of the sun begins.

　 The sun’s first layer from the outside begins about 10,000 miles above the visible surface and goes outward for millions of miles. This is the only part of the sun that can be seen during the eclipse such as　 the one in March, 1997. at any other time, the corona can be seen only when special parts are used on cameras and telescopes to shut out the burning light of the sun’s rays.

　 The corona rays are made up of gases streaming outward at great speeds and reaching a temperature of more than 2 million degrees Fahrenheit. The rays of gas thin out as they reach the space around the planets. By the time the sun’s rays reach the earth, they are weak and invisible.

39. As a collector progresses, and becomes specialized, he is able to ____.

　 A. identify the techniques and art used in printing a stamp

　 B. tell the designer of a stamp

　 C. reproduce water marks in the papers used from stamps

　 D. predict the future value of a stamp.