2011年12月大学英语四级考试模拟试题(九)

enthree

        　　A study published recently in the journal Nature shows that air-borne leaded gas emissions from the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutron, an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic (北极的) snow were declining.
        　　In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different from the ratios of European, Asian and Canadian gasoline and thus enabled scientists to differentiate (分区) the lead sources. The dominant lead ratio found in Greenland snow matched that found in gasoline from the United States.
        　　In a study published in the journal Ambio, scientists found that lead levels in soil in the North-eastern United States had decreased markedly since the introduction of unleaded gasoline.
        　　Many scientists had believed that the lead would stay in soil and snow for a longer period.
        　　The authors of the Ambio study examined samples of the upper layers of soil taken from the same sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990.
        　　The forest environment processed and redistributed the lead faster than the scientists had expected.
        　　Scientists say both studies demonstrate that certain parts of the ecosystem (生态系统 ) respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.
        　　62. The study published in the journal Nature indicates that ________.
        　　A) the Clean Air Act has not produced the desired results
        　　B) lead deposits in arctic snow are on the increase
        　　C) lead will stay in soil and snow longer than expected
        　　D) the US is the major source of lead pollution in arctic snow
        　　63. Lead accumulation worldwide decreased significantly after the use of unleaded gas in the US ________.
        　　A) was discouraged C) was prohibited by law
        　　B) was enforced by law D) was introduced
        　　64. How did scientists discover the source of lead pollution in Greenland?
        　　A) By analyzing the data published in journals like Nature and Ambio.
        　　B) By observing the lead accumulations in different parts of the arctic area.
        　　C) By studying the chemical elements of soil and snow in Northeastern America.
        　　D) By comparing the chemical compositions of leaded gasoline used in various countries.
       
            
            

enfive

        　　65. The authors of the Ambio study have found that ________.
        　　A) forests get rid of lead pollution faster than expected
        　　B) lead accumulations in forests are more difficult to deal with
        　　C) lead deposits are widely distributed in the forests of the US
        　　D) the upper layers of soil in forests are easily polluted by lead emissions
        　　66. It can be inferred from the last paragraph that scientists ________.
        　　A) are puzzled by the mystery of forest pollution
        　　B) feel relieved by the use of unleaded gasoline
        　　C) still consider lead pollution a problem
        　　D) lack sufficient means to combat lead pollution
        　　Part V Cloze (15 minutes)
        　　Directions: There are 20 blanks in the following passage. For each blank there are four choices marked A), B), C) and D) on the right side of the paper. You should choose the ONE that best fits into the passage. Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre.
        　　For the past two years, I have been working on students' evaluation of classroom teaching. I have kept a record of informal conversations __67__ some 300 students from at __68__ twenty-one colleges and universities. The students were generally __69__ and direct in their comments __70__ how course work could be better __71__. Most of their remarks were kindly ___72___ - with tolerance rather than bitterness-and frequently were softened by the __73__ that the students were speaking __74__ some, not all, instructors. Nevertheless, __75__ the following suggestions and comments indicate, students feel __76__ with things-as-they-are in the classroom.
        　　Professors should be __77__ from reading lecture notes. "It makes their __78__ monotonous(单调的)."
        　　If they are going to read, why not __79__ out copies of the lecture? Then we __80__ need to go to class. Professors should __81__ repeating in lectures material that is in the text-book. "__82__ we've read the material, we want to __83__ it or hear it elaborated on, __84__ repeated." "A lot of students hate to buy a __85__ text that the professor has written __86__ to have his lectures repeat it."
       
            
            

entwo

        　　67. A) involving B) counting C) covering D) figuring
        　　68. A) best B) least C) length D) large
        　　69. A) reserved B) hard-working C) polite D) frank
        　　70. A) over B) at C) on D) of
        　　71. A) presented B) submitted C) described D) written
        　　72. A) received B) addressed C) made D) taken
        　　73. A) occasion B) truth C) case D) fact
        　　74. A) on B) about C) at D) with
        　　75. A) though B) whether C) as D) if
        　　76. A) dissatisfied B) unsatisfactory C) satisfied D) satisfactory
        　　77. A) interfered B) interrupted C) discouraged D) disturbed
        　　78. A) voices B) sounds C) pronunciation D) gestures
        　　79. A) hold B) leave C) drop D) give
        　　80. A) couldn't B) wouldn't C) mustn't D) shouldn't
        　　81. A) refuse B) prohibit C) prevent D) avoid
        　　82. A) Once B) Until C) However D) Unless
        　　83. A) remember B) argue C) discuss D) keep
        　　84. A) yet B) not C) and D) or
        　　85. A) desired B) revised C) required D) deserved
        　　86. A) about B) how C) but D) only
        　　Part VI Translation (5 minutes)
        　　Directions: Complete the sentences on Answer Sheet 2 by translating into English the Chinese given in brackets.
        　　87. In fact, Peter would rather have left for San Francisco ________________________(而不愿待着纽约).
        　　88. I suggested he ____________________ (适应新环境) as soon as possible.
        　　89. A good many proposals were raised by the delegates, __________________________(正如预料的一样).
        　　90. ____________________________(即使计算是正确的), scientists can .never be sure that they have included all variables and modeled them accurately.
        　　91. If you don't like to swim, ____________________ (你不妨待在家里).
       
            
            

ensix

        　　Part I Writing
        　　Address of Welcome
        　　It is a great honor that professor Li is here to give us a lecture on computer science. Mr. Li is a prominent professor of Jiaotong University. He has been engaged in AI research for many years and has achieved a great success in this area.
        　　Computer is one of the greatest inventions in the 20th century. Since it came into being, the computer science, especially AI has developed rapidly and has changed our world radically. Due to its ability to think, memorize and with its amazing calculating speed, the computer is put to wide use in industry, agriculture, business, education and tourism. It is now widely believed that a person who has no computer literacy is like illiteracy in the past.
        　　Today, we are very happy to have invited professor Li to deliver a speech on the future development of AI. I am sure his lecture will benefit all of us. Now let's give him a big clap.
        　　Part II Reading Comprehension (Skimming and Scanning)
        　　1. Y 2. N 3. Y 4. Y 5. NG 6. N 7. N
        　　8. their independence career decision
        　　9. funds and equipment
        　　10. a vocational scholarship system
        　　Part III Listening Comprehension
        　　11~15 ABDDB 16~20 AABCB 21~25 CBCAD 26~30 CBADB 31~35 DDBBC
        　　36. reflects 37. particular 38. characteristic 39. elections 40. political
        　　41. support 42. especially 43. represent
        　　44. is supposed to be the party which represents property owners, businessmen and the self-employed
        　　45. enjoy a better standard of living and are suspicious of any change which might affect them
        　　46. Middle-class and working-class men can stand together at a football match and be the best of friends
        　　Part IV Reading Comprehension (Reading in Depth)
        　　47. N 48. E 49. O 50. A 51. M 52. L 53. J 54. I 55. G 56. B
        　　57~61 DBCBD 62~66 DBDAC
        　　Part V Cloze
        　　67~71 ABDCA 72~76 CDBBA 77~81 CADBD 82~86 ACBCD
        　　Part VI Translation
        　　87. than stayed in New York
        　　88. should adapt himself to new environment
        　　89. as was to be expected
        　　90. Even if the calculation is right
        　　91.may as well stay at home