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用戶線路指的是通信線路的哪部分

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從市話交換局的總配線架的縱列起，經(jīng)電纜進(jìn)線室、管道（或電纜通道）、交接設(shè)備、引上電纜、分線設(shè)備、引入線或經(jīng)過樓內(nèi)暗配線至用戶電話機(jī)的線路稱為用戶線路

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試題分類： 初級(jí)(口語)
練習(xí)次數(shù)：0次
試題分類： 初級(jí)(口語)
練習(xí)次數(shù)：0次
Part II Vocabulary and Structure Directions: In this part there are forty incomplete sentences. Each sentence is followed by four choices. Choose the one that best completes the sentence and then mark your answer on the Answer Sheet. 21. A great many cancers can be cured but only if before they have begun to spread or colonize in other parts of the body. A. properly treat B. properly treating C. being properly treated D. properly treated 22. she is a likeable girl, she is very difficult to work with. A. Since B. However C. As far as D. While 23. All the tourists gave the robber their money. A. frightened B. frightening C. frighten D. frightful 24. her age, she really did a good job in such a short time. A. Giving B. Gives C. Give D. Given 25. The soldier was with neglecting his duty. A. charged B. conducted C. charged D. committed 26. The reason why the car stopped was . A. because the road was not good B. that the road was not good C. due to the bad road D. because of the bad road 27. You’d better hurry, you might be late for class. A. or B. and C. unless D. but 28. , he performed the task with success. A. It was expected B. Which was expected C. As was expected D. That was expected 29. The doctor felt John’s arm to if the bone was broken. A. work out B. find out C. look at D. see out 30. He just my suggestion at the meeting yesterday. A. put away B. shut down C. showed off D. brushed aside 31. The question at the next meeting remain a secret. A. discussed B. to discuss C. to be discussed D. being discussed 32. His laziness his failure in the final exam. A. gave up B. contributed C. resulted in D. distributed 33. The teacher’s to my statement about this poet led me to read widely about poems. A. change B. charge C. challenge D. chance 34. On most of the nights, Jane reading letters from her boyfriend. A. stayed off B. stayed on C. stayed out D. stayed up 35. The first-year students were learning form the army in Miyun, a suburb of Beijing near I lived. A. what B. where C. that D. which 36. Lynda and hundreds of young people like him the post of typist. A. approached B. applied for C. appealed to D. approved of 37. Anybody is entitled to such benefit of age or sex. A. regardless B. whether C. in spite D. in case 38. In this building each apartment could a family of six. A. house B. cover C. make D. include 39. I tried to get out of the business, I found impossible. A. who B. which C. that D. what 40. When he explained it again and again, the student’s patience . A. ran over B. ran on C. ran out D. ran off 41. When her neighbor Grandma Wang became ill, the girl often . A. fitted in B. worked out C. held back D. helped out 42. If you really want to apply for the dangerous job, I won’t , thought I think it’s a crazy idea. A. stood in your way B. stand on the way C. stand in your way D. stand by the way 43. He was trying to read; , the phone kept ringing. A. meanwhile B. then C. later D. afterwards 44. I am out of those people who like a strenuous (費(fèi)力的) holiday; I believe in . A. took it easy B. taken it easy C. taking it easy D. taking it easily 45. The police matched the finger prints and found they were . A. equivalent B. identical C. similar D. equal 46. Formally, in the United States, many nurses worked as private duty nurses in hospitals. A. other than B. more than C. less than D. rather than 47. If you don’t mind. I do my homework than play cards with you. A. had better B. prefer C. would rather D. would like 48. Their idea was to get us to the strike at once. A. call at B. call off C. call in D. call for 49. My car so I had to come by bus. A. fell down B. broke down C. fell over D. turned away 50. I could tell he was surprised from the on his face. A. appearance B. sight C. expression D. explanation 51. Which is , North America or South America? A. biggest B. the biggest C. more biggest D. bigger 52. You should observe carefully how the audience his speech. A. reach to B. refer to C. react to D. relate to 53. These farmers got a good harvest last year, so they a big sum of money for new farm machines. A. set aside B. set about C. set up D. set back 54. One of my sayings is “where there is a will, there is a way.” A. likely B. favorable C. alike D. favorite 55. All is a continuous supply of fuel oil. A. what is needed B. that is needed C. the thing is needed D. for their needs 56. The high income tax is harmful it may discourage people from trying to earn more. A. in that B. that C. in which D. which 57. A new technique out, the yield increases by 20%. A. having working B. having been worked C. at a loss D. for good 58. The bird flew into the air and was soon . A. out of sight B. in a hurry C. at a loss D. for good 59. It is decided that he for a bus to meet the guests from Beijing. A. call B. calls C. arrange D. arranges 60. I know it’s not important but I can’t help about it. A. to think B. thinking C. and think D. being thought
試題分類： 大學(xué)英語六級(jí)
練習(xí)次數(shù)：1次
Part II Vocabulary and Structure Directions: In this part there are forty incomplete sentences. Each sentence is followed by four choices. Choose the one that best completes the sentence and then mark your answer on the Answer Sheet. 21. The teacher the students on a tour through the art museum. A. made B. indicated C. forced D. took 22. Tom’s parents died when he was a child, so he was by his relatives. A. grown up B. brought up C. raised D. fed up 23. Here is my card. Let’s keep in . A. touch B. relation C. connection D. friendship 24. So far there is no proof people from other planets do exist. A. which B. how C. what D. that 25. The newspapers reported yesterday several on the boundaries of these two countries. A. incidents B. happenings C. events D. accidents 26. We’ve worked out the plan and now we must put it into . A. fact B. reality C. practice D. deed 27. He didn’t and so he failed the examination. A. work enough hard B. hard work enough C. hard enough work D. work hard enough 28. Not until Mr. Smith came to China what kind of country she is. A. he knew B. he didn’t know C. did he know D. he couldn’t know 29. Scientists say it may be ten years this medicine was put to use. A. since B. before C. after D. when 30. In some countries, is called “equality” does not really mean equal rights for all people. A. that B. what C. which D. how 31. We didn’t know his telephone number, otherwise we him. A. would telephone B. would have telephone C. had telephoned D. must have telephoned 32. We’ve missed the last bus, I’m afraid we have no but to take a taxi. A. way B. possibility C. choice D. selection 33. Luckily, most sheep the flood last month. A. endured B. survived C. lived D. passed 34. My parents always let me have my own of living. A. way B. method C. manner D. fashion 35. Like other language skills, reading requires practice. A. the most of B. much of the C. most of the D. more of the 36. It is only through practice one will be able to swim skillfully. A. what B. who C. that D. which 37. The brain is capable of ignoring pain message of to concentrate on other activities. A. it allowed B. is it allowed C. allowed D. allowed it 38. Don’t worry, I have already them the decision. A. informed; with B. informed; of C. informed; for D. informed; that 39. The child was sorry his mother when he arrived at the station. A. to miss B. having missed C. missing D. to have missed 40. I wonder why he to discuss the problem at the meeting. A. declined B. rejected C. refused D. delayed 41. You can hang up what you like on these walls. A. bare B. empty C. blank D. vacant 42. According to a , the majority would rather have newspapers without a government than a government without newspapers. A. election B. campaign C. poll D. vote 43. The population of the village has decreased 150 to 500. A. in B. at C. by D. with 44. It seems that there is that I can’t do. A. nothing B. anything C. everything D. none 45. They are often caring more about animals than human beings. A. accused if B. accused with C. charged of D. charged for 46. a good beginning is made, the word is half done. A. As soon as B. While C. As D. Once 47. George could not his foolish mistake. A. account in B. count on C. count for D. account for 48. We came into this field late, so we must work hard to the lost time. A. make up for B. make out C. keep up with D. put up with 49. The new law will came into on the day it is passed. A. effect B. use C. service D. existence 50. We can separate the mixture into the pure chemical compounds it is composed. A. in which B. of what C. of which D. from which 51. Mrs. Lincoln has that she is unable to get a job. A. such small education B. so little education C. a such little education D. a so small education 52. She can’t prevent her little boy shooting birds. A. from; to B. on; at C. with; up D. from; at 53. Many countries are increasing their use of natural gas, wind and other forms of . A. energy B. source C. power D. material 54. A darkened sky in the daytime is usually and indication that a storm is . A. possible coming B. about to take place C. close by D. expected to be severe 55. We all know that speak louder than words. A. movements B. performance C. operations D. actions 56. , he could not cover the whole distance in fifteen minutes. A. Fast as he can B. As he can ran fast C. If he can ran fast D. Since he ran fast 57. Agricultural production in that country has increased in recent years. A. vastly B. strikingly C. considerably D. extremely 58. Peter has planned to some money every month so that he can buy a used car next year. A. set aside B. set up C. set in D. set along 59. Although I spoke to him many times, he never took any of what I said. A. attention B. notice C. warning D. observation 60. They overcame all the difficulties and fulfilled the plan three months ahead of time, is something we had not expected. A. that B. what C. it D. which
試題分類： 大學(xué)英語四級(jí)
練習(xí)次數(shù)：3次
Don't wash those fossils! Standard museum practice can wash away DNA. 1.Washing, brushing and varnishing fossils — all standard conservation treatments used by many fossil hunters and museum curators alike — vastly reduces the chances of recovering ancient DNA. 2.Instead, excavators should be handling at least some of their bounty with gloves, and freezing samples as they are found, dirt and all, concludes a paper in the Proceedings of the National Academy of Sciences today. 3.Although many palaeontologists know anecdotally that this is the best way to up the odds of extracting good DNA, Eva-Maria Geigl of the Jacques Monod Institute in Paris, France, and her colleagues have now shown just how important conservation practices can be.This information, they say, needs to be hammered home among the people who are actually out in the field digging up bones. 4.Geigl and her colleagues looked at 3,200-year-old fossil bones belonging to a single individual of an extinct cattle species, called an aurochs.The fossils were dug up at a site in France at two different times — either in 1947, and stored in a museum collection, or in 2004, and conserved in sterile conditions at -20 oC. 5.The team's attempts to extract DNA from the 1947 bones all failed.The newly excavated fossils, however, all yielded DNA. 6.Because the bones had been buried for the same amount of time, and in the same conditions, the conservation method had to be to blame says Geigl."As much DNA was degraded in these 57 years as in the 3,200 years before," she says. Wash in, wash out 7.Because many palaeontologists base their work on the shape of fossils alone, their methods of conservation are not designed to preserve DNA, Geigl explains. 8.The biggest problem is how they are cleaned.Fossils are often washed together on-site in a large bath, which can allow water — and contaminants in the form of contemporary DNA — to permeate into the porous bones."Not only is the authentic DNA getting washed out, but contamination is getting washed in," says Geigl. 9.Most ancient DNA specialists know this already, says Hendrik Poinar, an evolutionary geneticist at McMaster University in Ontario, Canada.But that doesn't mean that best practice has become widespread among those who actually find the fossils. 10.Getting hold of fossils that have been preserved with their DNA in mind relies on close relationships between lab-based geneticists and the excavators, says palaeogeneticist Svante P bo of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany.And that only occurs in exceptional cases, he says. 11.P bo's team, which has been sequencing Neanderthal DNA, continually faces these problems."When you want to study ancient human and Neanderthal remains, there's a big issue of contamination with contemporary human DNA," he says. 12.This doesn't mean that all museum specimens are fatally flawed, notes P bo.The Neanderthal fossils that were recently sequenced in his own lab, for example, had been part of a museum collection treated in the traditional way.But P bo is keen to see samples of fossils from every major find preserved in line with Geigl's recommendations — just in case. Warm and wet 13.Geigl herself believes that, with cooperation between bench and field researchers, preserving fossils properly could open up avenues of discovery that have long been assumed closed. 14.Much human cultural development took place in temperate regions.DNA does not survive well in warm environments in the first place, and can vanish when fossils are washed and treated.For this reason, Geigl says, most ancient DNA studies have been done on permafrost samples, such as the woolly mammoth, or on remains sheltered from the elements in cold caves — including cave bear and Neanderthal fossils. 15.Better conservation methods, and a focus on fresh fossils, could boost DNA extraction from more delicate specimens, says Geigl.And that could shed more light on the story of human evolution. (640 words nature ) Glossary Palaeontologists 古生物學(xué)家 Aurochs 歐洲野牛 Neanderthal (人類學(xué))尼安德特人，舊石器時(shí)代的古人類。 Permafrost (地理)永凍層 Questions 1-6 Answer the following questions by using NO MORE THAN THREE WORDS for each answer. 1.How did people traditionally treat fossils? 2.What suggestions do Geigl and her colleagues give on what should be done when fossils are found? 3.What problems may be posed if fossil bones are washed on-site? Name ONE. 4.What characteristic do fossil bones have to make them susceptible to be contaminated with contemporary DNA when they are washed? 5.What could be better understood when conservation treatments are improved? 6.The passage mentioned several animal species studied by researchers.How many of them are mentioned? Questions 7-11 Do the following statements agree with the information given in the passage? Please write TRUE if the statement agrees with the writer FALSE if the statement does not agree with the writer NOT GIVEN if there is no information about this in the passage. 7.In their paper published in the Proceedings of the National Academy of Sciences，Geigl and her colleagues have shown what conservation practices should be followed to preserve ancient DNA. 8.The fossil bones that Geigl and her colleagues studied are all from the same aurochs. 9.Geneticists don't have to work on site. 10.Only newly excavated fossil bones using new conservation methods suggested by Geigl and her colleagues contain ancient DNA. 11.Paabo is still worried about the potential problems caused by treatments of fossils in traditional way. Questions 12-13 Complete the following the statements by choosing letter A-D for each answer. 12.“This information” in paragraph 3 indicates: [A] It is critical to follow proper practices in preserving ancient DNA. [B] The best way of getting good DNA is to handle fossils with gloves. [C] Fossil hunters should wear home-made hammers while digging up bones. [D] Many palaeontologists know how one should do in treating fossils. 13.The study conducted by Geigl and her colleagues suggests: [A] the fact that ancient DNA can not be recovered from fossil bones excavated in the past. [B] the correlation between the amount of burying time and that of the recovered DNA. [C] the pace at which DNA degrades. [D] the correlation between conservation practices and degradation of DNA.
試題分類： 閱讀
練習(xí)次數(shù)：2次
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