【正文】 her engineer husband married a few years ago, they built a $100,000, threebedroom home in California. Tightly sealed to prevent air leak, the house was equipped with double paned（雙層玻璃的） windows and several other energysaving qualities. Problems began as soon as the couple moved in, however, Priscilla39。t worry much about unsealed cracks. Because of such leaks, the air in an average home was replaced by fresh outdoor air about once an hour. As a result, the pollutants caused by most households seldom built up to dangerous level. 56. It can be learned from the passage that the Ouchida39。s not easy, even desperate. We have many children left to place: 40 out of 75, said Straub, who works for a Parisbased foreignexchange programme called LEC. When exchange programmes started 50 years ago, family life was more acmodating（接納） . For one thing, more mothers stayed home. But now, increasing number of women work outside the home. Exchangestudent programmes have struggled in recent years to sign up host families for 30,000 teenagers who annually e from abroad to spend an academic（學(xué)術(shù)） year in the United States, as well as the thousands more who participate（參與） in the summer programmes. School systems in many parts of the US, unhappy about accepting nontaxpaying students, have also strictly limited the number of exchange students they accept. At the same time, the idea of hosting foreign students is being less exotic. In searching for host families, who usually receive no pay, exchange programmes are increasingly broadening their appeals （要求） to include everyone from young to retirees （退休者） . We are open to many different types of families, said Vickie Weiner, eastern regional director for ASSE, a 25yearold programme that sends about 30,000 teenagers on academicyear exchange programmes worldwide. For elderly people, exchange students keep us young they really do, said Jean Forster, who is hosting 16yearold Nina Porst from Denmark. 60. Vickie Weiner is the person who________ . A. works for a programme called LEC B. works for a programme called ASSE C. is 25 years old D. hosts foreign students 61. The underlined word exotic means ________. A. difficult B. wonderful C. exciting D. acmodating 62. From the passage we can learn that at the beginning of the exchange programmes, ________. A. all the families could host foreign students B. only young couples could host foreign students C. only those who were retired could host foreign students D. those who were not too old could host foreign students 63. Which of the following is the best title of this passage? A. US Struggle to Find Host Families B. Idea of Hosting Students Is Different C. Foreignexchange Program Is Going On D. Exchange Students Keeps Old People Young C You are standing under the most famous neon lights in the centre of London, waiting to cross the road. Suddenly the traffic stops. You hear the distant sounds of cheering, clapping and shouting. Then, like a multicolored train, 2, 000 people with wheels on their feet zoom past you. You have just witnessed the London Skate, a twice weekly rollerskate event that attracts people in their hundreds and thousands London. Skate is a pletely free tour of the streets of London the only condition is that you go along on rollerskates. It lasts between two and three hours and by the end of it you have skated between 10 and 12 miles. The skate snakes sound the streets of London along several different routes. Many of the routes pass by tourist attractions such as Buckingham Palace and Big Ben. Marshals (交通協(xié)調(diào)員 ) go ahead of the group, stopping the traffic so that people can skate as safely as possible. Everyone is wele to take part and people from the age of 4 to 63 years old join the fun. I love it very much, it is amazing. It feels just like a carnival (狂歡節(jié) )， said Celeste Beverage regular skater. Rollerskating is really taking off across Europe and America. It is a very good way to keep fit and can be practised anywhere there is a smooth surface. Many big cities in Western Europe and in the US now have a regular group skating event. The biggest skates take place in Paris and Munich and tens of thousands of fans show up on warm evenings. Rollerskating is taking over the world, said Julian Grenoble, a 25yearold ski shop employee from London. Grenoble went to the ParisRoller (Paris skate) regularly until he moved to Britain. It39。t as wellbehaviored as they used to be. She recounts in detail how she used to be told to respect her elders and betters（上司） . She was taught to speak when she was spoken to and when she went out on her own, she was reminded to say please and thank you. Children in her days, she continues, were expected to be seen and not heard, but these days you are lucky if you ever hear parents telling their children to mind her manners. If you give her