21. We may infer that the writer's attitude towards the A-bomb is that______.

　　A. it is absolutely necessary

　　B. it is a terrible threat to the whole of mankind

　　C. it played a vital part in defeating the Japanese

　　D. it was a wonderful invention

　　22. The American and British scientists were astonished at the end of the Second World War against Germany because______.

　　A. the Germans had been defeated without the use of nuclear weapons

　　B. the Western countries had won before they had invented nuclear weapons

　　C. they thought the Germans would probably win the war

　　D. the Germans had made little progress in developing nuclear weapons

　　23. According to the writer, most scientists who had helped in making the A-bomb considered that it should not be used against the Japanese because______.

　　A. it was such a dangerous weapon

　　B. its use against the Japanese was unnecessary

　　C. it was a very inhumane weapon

　　D. the German war was finished

　　24. The passage implies, but does not directly say, that the nuclear scientists______.

　　A. might not have agreed to develop the bomb if there had been no Nazi threat

　　B. would have developed the bomb even without the Nazi threat

　　C. would have made the bomb, under peace-time conditions, but only for the use of an international authority

　　D. developed the bomb because Einstein thought it urgent and necessary

　　25. The main point in the second paragraph is______.

　　A. that nuclear weapons proved unnecessary

　　B. that the Franck Report, which recommended that the bomb should be placed in the hands of an international authority, was rejected

　　C. that many scientists tried, unsuccessfully, to persuade the politicians to abandon nuclear bombs, and place nuclear energy in the hands of an international authority

　　D. both A and C

　　21. B 22. D 23. B 24. A 25. C

　　Friends play an important part in our lives, and although we may take the friendship for granted, we often don't clearly understand how we make friends. While we get on well with a number of people, we are usually friends with only a very few, for example, the average among students is about 6 per person. In all the cases of friendly relationships, two people like one another and enjoy being together, but beyond that, the degree of intimacy between them and the reasons for their shared interest vary enormously. As we get to know people we take into account things like age, race, economic condition, social position, and intelligence. Although these factors are not of prime importance, it is more difficult to get on with people when there is a marked difference in age and background.

　　Some friendly relationships can be kept on argument and discussion, but it is usual for close friends to have similar ideas and beliefs, to have attitudes and interests in common—they often talk about "being on the same wavelength". It generally takes time to reach this point. And the more intimately involved people become, the more they rely on one another. People want to do friends favors and hate to break a promise. Equally, friends have to learn to put up with annoying habits and to tolerate differences of opinion.

　　In contrast with marriage, there are no friendship ceremonies to strengthen the association between two people. But the supporting and understanding of each other that results from shared experiences and emotions does seem to create a powerful bond, which can overcome differences in background, and break down barriers of age, class or race.

　　26. According to the author, _______.

　　A. all those who get on well with each other are friends

　　B. friends are closer than people who just get on well with each other

　　C. everyone understands clearly how to make friends

　　D. every student has 6 friends

　　27. When we make friends, we consider such things as age, race, and background, because _______.

　　A. it is not easy to have a friendly relationship with people when there is a marked difference in age and background

　　B. the degree of friendship between two people and the reasons for their shared interest can vary greatly

　　C. friends need to know all these things

　　D. these are the most important factors to make friends

　　28. In Paragraph 2, "being on the same wavelength" means_______.

　　A. using the same frequency while talking

　　B. keeping the same friendly relationship as other people do

　　C. having similar ideas, beliefs, attitudes and interests

　　D. having the same background

　　29. Which of the following is not implied in the passage?

　　A. Even friends may have differences of opinion.

　　B. Friends never argue with each other.

　　C. It generally takes time for people to become close friends.

　　D. Someone's habits may annoy his friends.

　　30. To strengthen friendly relationship, people_______.

　　A. must hold friendship ceremonies

　　B. have to eliminate differences in background

　　C. should make friends with those who are of the same age and of the same race

　　D. should support and understand each other through shared experiences and emotions

　　26. B 27. A 28. C 29. B 30. D