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.
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.”
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).
2007年cet4最新预测试卷精选参考答案
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.
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