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Questions 17-20 are based on the following passage. You now have 20 seconds to read the questions 17-20 What is the purpose of building new houses facing north or south
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Among the most popular books being written today are those which are usually classified as science fiction. It is a broad type of fiction that often involves (36) based on current or future science or (37) . Science fiction is found in books, art, television, films, games, theater, and other media. Hundreds of (38) are published every year and read by all kinds of people. (39) , some of the most successful films of recent years have been based on science fiction stories. Most of the (40) of science fiction, however, have been written within the last one hundred years. Books by writers, such as Jules Verne and H. G. Wells, to (41) just two well-known authors, have been translated into many languages. Modem science fiction writers don’t write about men from Mars of space (42) stories. It is often thought that science fiction is a fairly new development in (43) , but its origin can be found in books written hundreds of years ago. (44) , a theme which is still found in modem-stories. (45) ; or in imaging future worlds which are a reflection of the world which we live in now. Because of this, their writing has obvious political meaning. (46) , the writers may find it difficult to keep ahead of scientific advances.
属于黄酮醇类化合物的是（）
电缆夹层的净高，不得小于2000mm，但不宜大于3000mm。( )
Since the 1960s, a lot of houses have been built in the suburbs, far from the centers of large cities. While more and more people are working in and around the big cities, most (47) not to live in city conditions. As the suburbs grow, except in the biggest cities which are tourist attractions in themselves the central areas are losing commerce to the suburbs. Modem American women are (48) to buying all their food in weekly visits to the (49) , bringing it home in the car. Once an American has reached his home he is interested in working to (50) it--making things, mending things--to make it as pleasant as possible. There is a strong (51) to spend much free time at home when the home is well-equipped, comfortable and (52) ; even the private swimming pool is no longer (53) for the very rich. Americans invite their friends to their homes more than most people in Europe. Parties for children and for grown-ups are (54) occupying the leisure hours, usually with something to drink. In their suburbs Americans are extremely friendly. But Americans are a (55) people who are always ready to move. So, although they enjoy the life in the suburbs, they will by no means end their (56) there. When his income rises as his career makes progress, he soon looks for a better house.A) pursuitF) improve K) supermarketB) restlessG) desire L) extremelyC) constantlyH) accustomed M) ritualD) surrenderI) attractive N) attachedE) reservedJ) prefer O) transform
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