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从下列每篇短文的问题后所给的四个选择项中选出一个最佳答案。Passage One Questions 21 to 25 are based on the following passage. Your passport is your official identification as an American citizen. In America，most people never consider obtaining a passport unless they are planning a trip out of the country. In Europe, where travel from one country to another is much more common，almost everyone carries a passport. A passport is final proof of identity in almost every country in the world. In 1979 almost 15 million Americans held passports. Most of these passports were obtained to travel outside the country because，except for a few Western nations。passports are required to enter every country. And if you travel abroad，you must have a valid passport to reenter the country. When traveling abroad，you will need a passport for identification when exchanging dollars for francs or marks or other foreign currency. You may also need your passport to use a credit card，buy an airplane ticket or check into a hotel. As a passport is an official U. S. document. it is valuable as identification in any emergency cases，such as floods，fires，or war. Don’t confuse passports and visas. Whereas a passport is issued by a country to its citizens. a visa is official permission to visit a country granted by the government of that country. For some years，many countries were dropping their visa requirements，but that trend has reversed. Argentina，Brazil，and Venezuela now require visas from U. S. citizens. They may be obtained from the embassy of the country you wish to visit. Passport applications are available at passport agency offices in large cities like Boston，New York，or Chicago. In smaller cities，applications are available at post offices and at federal courts. To get your first passport，you must submit the application in person. along with a birth certificate and two pictures. As used in this passage，the word“valid”in the second paragraph means______
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It would be completely irresponsible and unethical to use drugs on people that______(not test)thoroughly on animals.
Passage Two Questions 26 to 30 are based on the following passage. A few years ago it was fashionable to speak of a generation gap，a division between young people and their elders. Parents complained that children did not show them proper respect and obedience，while children complained that their parents did not understand them at all. What had gone wrongWhy had the generation gap suddenly appearedActually，the generation gap has been around for a long time. Many critics argue that it is built into the fabric of our society. One important cause of the generation gap is the opportunity that young people have to choose their own life styles. In more traditional societies，when children grow up，they are expected to live in the same area as their parents，to marry people that their parents know and approve of，and often to continue the family occupation. In our society，young people often travel great distances for their educations，move out of the family home at an early age，marry-or live with-people whom their parents have never met，and choose occupations different from those of their parents. In our upwardly mobile society，parents often expect their children to do better than they did：to find better jobs，to make more money，and to do all the things that they were unable to do. Often，however，the ambitions that parents have for their children are another cause of the division between them. Often，they discover that they have very little in common with each other. Finally，the speed at which changes take place in our society is another cause of the gap between the generations. In a traditional culture，elderly people are valued for their wisdom，but in our society the knowledge of a lifetime may become obsolete overnight. The young and the old seem to live in two very different worlds，separated by different skills and abilities. No doubt，the generation gap will continue to be a feature of American life for some time to come. Its causes are rooted in the freedoms and opportunities of our society，and in the rapid pace at which society changes. Which one is NOT the cause of the generation gap
下列短文中有十个空白，每个空白有四个选项。根据上下文要求选出最佳答案。Henry’s job was to examine cars which crossed the frontier to make sure that they were not smuggling anything into the country. Every morning，except at weekends，he (11) see a factory worker coming up the hill towards the frontier， (12) a bicycle with a big load of old straw on it. When the bicycle arrived the frontier，Henry used to stop the man and order him to take the straw off. Then he would examine the straw very carefully to see (13) he could find anything，after which he would look in all the man’s pockets before he let him tie the straw up again. The man would then put it on his bicycle and go off down the hill with it. Although Henry was always (14) to find gold or jewelry or other valuable things hidden in the straw，he never found (15) ，even though he examined it very carefully. He was sure that the man was smuggling something，but he was not (16) to imagine what it could be. Then one evening，after he had looked through the straw and emptied the factory worker’s pockets (17) usual，he said to him，“Listen，I know that you are smuggling things (18) this frontier. Won’t you tell me what it is that you’re bringing into the country so successfullyI’m an old man，and today’s my last day on the job. Tomorrow I’m going to (19) . I promise that I shall not tell anyone if you tell me what you’ve been smuggling. ”The factory worker did not say anything for (20) . Then he smiled，turned to Henry and said quietly：“Bicycles. ”
41～45题基于以下题干： 投资者K考察6个项目一共花了14天的时间： (1)他考察的每一个项目都在X，Y和Z 3个城市中； (2)每一个城市都有很多项目； (3)他在每一个城市至少考察一个项目； (4)他在每一个项目至少要花上两天的时间； (5)他在每一个项目中花的时间的天数都是整数。 若K在X市的项目中恰好花了8天的时间，则下面哪一项不可能正确
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