4、光的波粒二象性；

3、光电管；

2、光子说；

1、光电效应；

60.It is the old man’s birthday today. Now he is sitting on a sofa alone. Maybe his wife has been dead. On the right side is a big birthday cake sent by his son. And there are also some presents given by his daughter on the left. Yet the old man doesn’t feel happy. Instead, he looks very sad because he is lonely.

　 Our life is getting better and better than before. Some people think that old people will be satisfied as long as they have enough to eat and drink. I think they are quite wrong. Old people easily get lonely because they have no work to do. So we should spend time together with them and take care of them in every possible way.

59.Dear Amy:

　 Thank you for your letter. I am so glad to have a talk about your present situation with you.

　 People often miss their parents the first time they leave home. Most people do have to leave home for higher education or employment. You cannot live with your parents forever. I think you should realize that present separation will help your academic development and your improvement of personal ability.

　 You need to make friend on your school campus, sharing ideas with your classmates who are physically closest to you now. Maybe you will still miss your parents, but your new friends will bring you happiness and joy to your new life. Also I suggest you enjoy yourself by taking an active part in different kinds of activities in school. You will get much pleasure from it.

　 Wish you happy every day.

　 Faithfully yours

　 ×××

58.Dear Editor:

　 I am a new student at Haining Hongda Senior High School. My home is far from Haining, so I must live at school. This is the first time for me to get away from my parents. I feel very sad. When I left home, I couldn’t help tearing myself away from them. I do not want to be alone at school, and I am a shy girl. I have been crying in bed at night these days. I want to stay at home forever. I miss my parents very much. Could you tell me what to do?

　 Your early reply is expected.

　 Regards,

57.Dear editor,

　 I'm a student in Senior Three. We have made a survey--"Who do you turn to when in trouble?" Here are the results.

　 Most of the students will go to their classroom or friends when in trouble they're almost of the same age, so they can talk with and understand each other easily. Some students will tell their teachers or parents about their troubles and ask for their help as the teachers and parents have rich experience and love them very much. They can be trusted by these students. Only a few students solve their problems all by themselves. They hate to talk with others and can’t get on well with others. They have few friends.　　 In my opinion, when in trouble we’d better ask our teachers, parents, friends or classmates for help. Different people have different experiences. And they are likely to help you out of the troubles. Then you can remove some of your difficulties and feel relaxed.

　 Thank you. Best wishes!

　 Yours,　 Jack

56.It is known to us all that some students copy others’ homework. As students, we have to do plenty of homework both at home and at school, but sometimes we have some homework which is too difficult for us. On the other hand, some students are lazy, and are not interested in their lessons. They don’t work hard. In order to finish the assignments and please their teachers, some students copy others’ homework.

　　 In my opinion, it is wrong to copy others’ homework because it breaks the school rules. Students should be honest and try to finish our homework by ourselves instead of by copying. Even though we have trouble doing our homework we can ask our classmates or teachers for help.

55.One possible version:

　 　The boy and the girl in the picture sat on a bench talking merrily while eating a water-melon. When they went away they left the melon’s skin on the bench, making it very dirty. They didn’t want to take any trouble throwing it into the dustbin although it was very near where they were sitting. Instead, they said that there would be someone who should clean the rubbish.

　 However, what they did violate public morality. If everyone behaves in this way, the world will be a big rubbish dump with flies flying round and people will live in a world of diseases. Besides, dustmen will have a very, very hard job to clean the world we live in.

　 My opinion on copying others’ homework.