A long time ago, at a national conference on biology, he cautiously ______ his new theory on life.

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• I was just a boy when my father brought me to Harlem for the first time, almost 50 years ago. We stayed at the Hotel Theresa, a grand brick structure at 125th Street and Seventh Avenue. Once, in the hotel restaurant, my father pointed out Joe Louis. He even got Mr Brown, the hotel manager, to introduce me to him, a bit paunchy but still the champ as far as I was concerned.

  Much has changed since then. Business and real estate are booming. Some say a new renaissance is under way. Others decry what they see as outside forces running roughshod over the old Harlem. New York meant Harlem to me, and as a young man I visited it whenever I could. But many of my old haunts are gone. The Theresa shut down in 1966. National chains that once ignored Harlem now anticipate yuppie money and want pieces of this prime Manhattan real estate. So here I am on a hot August afternoon, sitting in a Starbucks that two years ago opened a block away from the Theresa, snatching at memories between sips of high-priced coffee. I am about to open up a piece of the old Harlem -- the New York Amsterdam News -- when a tourist asking directions to Sylvia's, a prominent Harlem restaurant, penetrates my daydreaming. He's carrying a book: Touring Historic Harlem. History. I miss Mr Michaux's bookstore, his House of Common Sense, which was across from the Theresa. He had a big billboard out front with brown and black faces painted on it that said in large letters: "World History Book Outlet on 2,000,000,000 Africans and Nonwhite Peoples." An ugly state office building has swallowed that space. I miss speaker like Carlos Cooks, who was always on the southwest corner of 125th and Seventh, urging listeners to support' Africa. Harlem's powerful political electricity seems unplugged -- although the streets are still energized, especially by West African immigrants. Hard-working southern newcomers formed the bulk of the community back in the 1920s and '30s, when Harlem renaissance artists, writers, and intellectuals gave it a glitter and renown that made it the capital of black America. From Harlem, W. E. B. DuBois, Langston Hughes, Paul Robeson, Zora Neal Hurston, and others helped power America's cultural influence around the world. By the 1970s and '80s drugs and crime had ravaged parts of the community. And the life expectancy for men in Harlem was less than that of men in Bangladesh. Harlem had become a symbol of the dangers of inner-city life. Now, you want to shout "Lookin' good!" at this place that has been neglected for so long. Crowds push into Harlem USA, a new shopping centre on 125th, where a Disney store shares space with HMV Records, the New York Sports Club, and a nine-screen Magic Johnson theatre complex. Nearby, a Rite Aid drugstore also opened. Maybe part of the reason Harlem seems to be undergoing a rebirth is that it is finally getting what most people take for granted. Harlem is also part of an "empowerment zone" a federal designation aimed at fostering economic growth that will bring over half a billion in federal, state, and local dollars. Just the shells of once elegant old brownstones now can cost several hundred thousand dollars. Rents are skyrocketing. An improved economy, tougher law enforcement, and community efforts against drugs have contributed to a 60 percent drop in crime since 1993. At the beginning the author seems to indicate that Harlem A．has remained unchanged all these years. B．has undergone drastic changes. C．has become the capital of Black America. D．has remained a symbol of the dangers of inner-city life.

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• What does the author mean by saying "Even for people who exercise， spending long stretches of time sitting at a desk is still harmful？" （Para.6）？ 查看材料

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• Are you going on holiday for a long time？ （).

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• A few years ago it was common to speak of a generation gap between young people and their elders.Parents said that children did not respect and listen to them, while children said that their parents did not understand them at all.What had gone wrong？ Why had the generation gap suddenly appeared？ Actually, the generation gap has been around for a long time.Many people argue that it is built into every part of our society.

  One important cause of the generation gap is the opportunity that young people have to choose their own ways of life.In a more traditional society, when children grow up, they are expected to live in the same area as their parents, to marry people that their parents know and like, and often to continue the family jobs.In our society, young people often travel great distances for their education, move out of the family at an early age, marry or live with people whom their parents have never met, and choose jobs different from those of their parents. In our 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, that is another cause of the gap 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 the third cause of the gap between the generations.In a traditional culture, senior people are valued for their knowledge, but in our society the knowledge of a lifetime may become out of date.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 in American life for some time to come. 1.The first paragraph tells us that ______. A、the problem of the generation gap draws much attention from people B、it is out of date to talk about the generation gap C、children and parents are trying to understand each other D、it is very important for people to frequently communicate with each other 2.In a more traditional society, old people_______. A、have their children respect and listen to them B、do not care for their children at all C、expect their children to rebel against them D、do not live together with their children 3.In American society young people________. A、do not need to find jobs B、leave home at an early age C、have better education than their parents D、marry people younger than them 4.Which of the following is NOT the cause of the generation gap______. A、Young people like to depend more on themselves. B、Parents do not love their children dearly. C、American society changes rapidly. D、Parents expect too much of their children. 5.The main idea of the passage is ________. A、that the generation gap needs considering B、when the generation gap is necessary in American society C、why the generation gap exist D、how we can reduce the generation gap

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• When Abdullah Younis, CFA, was hired as a portfolio manager at an asset management firm two years ago, he was told he could allocate his work hours as he saw fit. At that time, Younis served on the bo

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• Can online education ever be education of the very best sort？ Not long ago I watched an online course. The instructor was intelligent and learned. But the course wasn t great and could never have been. There were students on hand, but the class seemed addressed to no one in particular. There was nothing you could get from that course that you couldn t get from a good book on the same subject. A truly memorable college class is a cooperation between teacher and students. It s a one-time-only event. Learning at its best is collective work. In real courses the students and teachers come together and create a vital atmosphere of learning. I don t think an Internet course ever will.

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