专业八级-198及答案解析.doc

1、专业八级-198 及答案解析(总分：100.00，做题时间：90 分钟)一、LISTENING COMPREHENS(总题数：0，分数：0.00)二、SECTION A MINI-LECTU(总题数：1，分数：60.00)The Cloning Technology. The difference between a 1 colony and cloning a mammal A. Clarify the illusion: scientists have been cloning genes for years. B. Definition of clone: a clone is popu

2、lation of cells produced by 2 ; all the cells in a clone have exactly the 3 , using a process known as “recombinant 4 technology“. C. Clone a mammal: “nuclear transfer“. . Genes, chromosomes and the genome A. Genes - DNAits 5 makes it divide easily. - 6 of chemical groups within DNA form genes. - Ge

3、nes determine what 7 a given cell will have. B. Chromosomes: genes are linked together to form chromosomes. C. Genome: the entire collection of chromosomes in each cell. D. 8 genes enables scientists to mass-produce proteins that can be used to 9 . . The process of cloning a gene A. Remove DNA from

4、the cell. B. DNA is cut into pieces using 10 . C. To replicate DNA, attach them to non-mammalian DNA. D. Plasmids are easily incorporated into 11 and multiply by themselves. E. The plasmid carries the gene into a 12 cell. F. The gene 13 a plasmid and some proteins. G. The plasmid 14 . H. Copies pass

5、ed to the cell“s 15 . I. Each cell contains one or more copies of the recombinant DNA molecule. The gene is now considered cloned. （分数：60.00）填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_三、SECTION B CONVERSATI(总题数：2，分数：40.00)（分数：20.00）A.Husb

6、and and wife.B.Professor and student.C.Client and librarian.D.Customer and waitress.A.L9231358.B.L9321185.C.L9231385.D.L9213835.A.15 Lonkon Street, Annandale.B.50 Lonkon Street, Annandale.C.51 Lonkon Street, Annandale.D.15 London Street, Annandale.A.Description of the district.B.Environmental protec

7、tion.C.Important reports in Australia.D.Australian government.A.Three weeks.B.Two weeks.C.Six weeks.D.Four weeks.（分数：20.00）A.Credit card.B.Cash.C.Money order.D.Cheque.A.The author.B.The publication date.C.The page number of the book.D.The title of the book.A.Land Degradation in Australia.B.The Envir

8、onmental Impact of Travel and Tourism.C.Environmental Chemistry.D.Environmental Law.A.Email service.B.Telephone service.C.Letter service.D.Express service.A.$5.B.$0.50.C.$0.25.D.$1.专业八级-198 答案解析(总分：100.00，做题时间：90 分钟)一、LISTENING COMPREHENS(总题数：0，分数：0.00)二、SECTION A MINI-LECTU(总题数：1，分数：60.00)The Cloni

9、ng Technology. The difference between a 1 colony and cloning a mammal A. Clarify the illusion: scientists have been cloning genes for years. B. Definition of clone: a clone is population of cells produced by 2 ; all the cells in a clone have exactly the 3 , using a process known as “recombinant 4 te

10、chnology“. C. Clone a mammal: “nuclear transfer“. . Genes, chromosomes and the genome A. Genes - DNAits 5 makes it divide easily. - 6 of chemical groups within DNA form genes. - Genes determine what 7 a given cell will have. B. Chromosomes: genes are linked together to form chromosomes. C. Genome: t

11、he entire collection of chromosomes in each cell. D. 8 genes enables scientists to mass-produce proteins that can be used to 9 . . The process of cloning a gene A. Remove DNA from the cell. B. DNA is cut into pieces using 10 . C. To replicate DNA, attach them to non-mammalian DNA. D. Plasmids are ea

12、sily incorporated into 11 and multiply by themselves. E. The plasmid carries the gene into a 12 cell. F. The gene 13 a plasmid and some proteins. G. The plasmid 14 . H. Copies passed to the cell“s 15 . I. Each cell contains one or more copies of the recombinant DNA molecule. The gene is now consider

13、ed cloned. （分数：60.00）填空项 1:_ （正确答案：single cell）解析： single cell 听力原文 The Cloning TechnologyToday, we are going to talk about the cloning technique. First, we will see the difference between a single cell colony and cloning a mammal. Then we will focus on cell cloning process and its scientific use. I

14、n March 1997, the world said “hello“ to Dolly, the first mammal to be cloned from an adult cell. We asked ourselves: Would the world soon be populated with human clones? Did you know that cloning isn“t new? In fact, scientists have been cloning genes for many years in laboratories around the world.

15、Of course, cloning a genes and cloning a whole mammal are quite different in terms of process and product. But just how do you get from a single cell to a clone? We generally think of cloning as producing a duplicate of something. Scientists, however, usually use the term clone in referring to cells

16、. A clone is population of cells produced by one ancestor. Because of the way cells multiply, all the cells in a clone have exactly the same genetic makeup. Gene cloning uses a process known as “recombinant DNA technology“. By contrast, cloning a mammal, such as the sheep Dolly, involves a technolog

17、y known as “nuclear transfer“. Although the end result is the same, the actual processes of gene cloning and mammalian cloning are quite different. But we need to start from the beginning to understand how these complicated and amazing bioengineering technologies evolved. Now, we will study on what

18、genes, chromosomes, and the genome are. Within the body of a mammal, tissues are made of cells. Inside each cell is a long molecule called DNA. Its shape enables it to divide easily. Arrangements of chemical groups within DNA form genes. Genes direct cells to produce proteins, and thus determine wha

19、t function a given cell will have. For example, skin cells produce proteins which are present in skin tissue, and blood cells produce a protein present in blood. Genes essentially tell each cell what type it is. Genes are linked together to form chromosomes. The entire collection of chromosomes in e

20、ach of your cells is called genome. All the cells in your body contain the same genome. Once you realize that all cells contain the information for making the whole organism, you know that cloning is theoretically possible. But what makes a skin cell different from a blood cell? The chromosomes with

21、in the nucleus of each cell are folded in various ways. Genes that are buried within the chromosomes are inactive, or switched off, while genes on the surface of the chromosomes are active. In a skin cell, the genes for producing skin proteins are active, while in a blood cell, the gene is active. G

22、ene cloning is the process of producing a population of cells all of which contain a specific gene. Using these identical cells, scientists can study the entire genome and obtain clues to how genes are switched on and off. Cloning genes also enables scientists to mass-produce proteins that can be us

23、ed to treat a variety of diseases. For example, the cells in the pancreas produce a protein called insulin which is important in helping the body maintain appropriate blood sugar levels. Some people have a disease called diabetes because their cells don“t produce enough insulin. Cloning the insulin

24、gene has provided a way of producing large amounts of human insulin which is used to treat diabetes. Then, we are going to disclose the mystery of cloning a gene. To clone a gene, scientists remove the DNA from a cell, isolate the specific gene of interest, and then get it to multiply. Sound simple?

25、 Not so fast. Let“s look at each step. First the DNA must be removed from the cell. Over the years scientists have perfected chemical methods for doing this, based on the physical properties of DNA molecules. The DNA is then cut into pieces using special proteins. You may think of these special prot

26、eins as little knives programmed to cut the DNA in specific places. By using the correct special proteins, scientists can isolate whatever gene they want. Once the gene is isolated, it can then be duplicated. Mammalian genes do not reproduce by themselves, however. To replicate them, scientists atta

27、ch them to pieces of non-mammalian DNA that do replicate on their own. The most common procedure uses small circular pieces of DNA called plasmids that come from bacteria. Plasmids have two useful characteristics. They are easily incorporated into bacteria, they multiply by themselves inside bacteri

28、a. The gene of interest is combined with a plasmid and some proteins. The proteins open the plasmid circle and stitch in the new gene. The result is a recombinant DNA molecule. The plasmid carries the gene into a host cell. Once inside the host, the plasmid multiplies, making lots of copies of itsel

29、f and the gene it contains. When the host cell divides, copies of the recombinant DNA molecule are passed to the cell“s offspring. As the bacterial cells continue to divide, a colony of identical cells is produced. Each cell contains one or more copies of the recombinant DNA molecule. The gene is no

30、w considered cloned. Let“s go back now to the example of the insulin gene. Prior to cloning this gene, scientists purified insulin from animal sources, like pigs or cows. Scientists isolated the insulin gene from the DNA of human pancreatic cells. Then they attached the insulin gene to a plasmid and

31、 were able to get bacterial cells to incorporate the recombinant DNA. The result was a colony of bacteria that continually produced human insulina little insulin producing factory! 解析 要点题。在讲座的开始部分先说明了讲座的安排。第一个要点就是：First, we will see the difference between a single cell colony and cloning a mammal. 因

32、此答案为 single cell。 填空项 1:_ （正确答案：one ancestor/the same ancestor）解析： one ancestor/the same ancestor解析 细节题。根据讲座中关于克隆定义的内容“A clone is population of cells produced by one ancestor. ”可知答案为 one ancestor。 填空项 1:_ （正确答案：same genetic makeup）解析： same genetic makeup解析 细节题。根据讲座原文“Because of the way cells multipl

33、y, all the cells in a clone have exactly the same genetic makeup. ”即可得出答案。 填空项 1:_ （正确答案：DNA）解析： DNA解析 细节题。讲座里出现过“recombinant DNA technology”这个词组。况且 DNA是大家比较熟悉的术语，应该不难解答。 填空项 1:_ （正确答案：shape）解析： shape解析 细节题。讲座里明确做了解释说：Inside each cell is a long molecule called DNA. Its shape enables it to divide eas

34、ily. (DNA容易分裂是由它的形状决定的。)所以答案为shape。 填空项 1:_ （正确答案：Arrangements）解析： Arrangements解析 推断题。讲座中提到：Arrangements of chemical groups within DNA form genes. (DNA中的化学组织的排列决定了基因。)所以答案为 arrangements。 填空项 1:_ （正确答案：functio）解析： function解析 细节题。讲座中说道：Genes direct cells to produce proteins, and thus determine what fu

35、nction a given cell will have. (基因指示细胞产生蛋白质，最后决定哪些细胞有哪些作用。)因此答案为 function。 填空项 1:_ （正确答案：Cloning）解析： Cloning解析 细节题。讲座中提到：Cloning genes also enables scientists to mass-produce proteins that can be used to treat a variety of disease. 填空用的是动名词形式。 填空项 1:_ （正确答案：treat diseases）解析： treat diseases解析 归总题。讲座

36、中相关内容是：Cloning genes also enables scientists to mass-produce proteins that can be used to treat a variety of diseases. 可见克隆技术可以用于治病，因此答案为 treat diseases。 填空项 1:_ （正确答案：special proteins）解析： special proteins解析 细节题。根据讲座内容“The DNA is then cut into pieces using special proteins. ”可直接得出答案。 填空项 1:_ （正确答案：b

37、acteria）解析： bacteria解析 细节题。根据讲座原文“They are easily incorporated into bacteria.”可以直接得出答案。这里要注意的是 bacteria是 bacterium(细菌)的复数。 填空项 1:_ （正确答案：host）解析： host解析 细节题。在讲述基因克隆的过程中，有很多烦琐难懂的步骤，但是讲座里提到：The plasmid carries the gene into a host cell. 因此答案为 host。 填空项 1:_ （正确答案：is combined with）解析： is combined with解析

38、 细节题。根据讲座原文“The gene of interest is combined with a plasmid and some proteins. ”即可得出答案。 填空项 1:_ （正确答案：multiplies）解析： multiplies解析 归总题。讲座提到克隆过程中质粒需要繁殖：Once inside the host, the plasmid multiplies, making lots of copies of itself and the gene it contains. 因此答案为multiplies。 填空项 1:_ （正确答案：offspring）解析： o

39、ffspring解析 细节题。根据讲座中提到的“copies of the recombinant DNA molecule are passed to the cell“s offspring”直接拷贝入题即可。 三、SECTION B CONVERSATI(总题数：2，分数：40.00)（分数：20.00）A.Husband and wife.B.Professor and student.C.Client and librarian. D.Customer and waitress.解析：听力原文 L: Good morning, City Central Library. May I

40、help you? M: Yes, I want to order some books please. You can send them to me through the post or courier, can“t you? L: Yes, certainly. Let me get the form and take down some details. First, your name please, sir. M: Willy Humpshire. That“s capital H-U-M-P-S-H-I-R-E. L: Willy Humpshire. And your mem

41、bership number? M: That“s L 9231385. L: L923 . M: 1385. L: Thank you. Now your address please. That“s the address you want us to send the items to. M: It“s 15 Lonkon Street, Annandale. L: And could I have your phone number and your fax number please? M: They are the same, 663-6947. L: 663-6947. M: T

42、hat“s correct. L: Thank you. And may I ask why you“ll need the books? I“m sorry about this, but we have to have this information whenever we send books out from a telephone request. M: No problem. I“m preparing an article for the environment watch section of the local newspaper. We are quite concern

43、ed about the problems we are facing now, especially since we“ve been getting so many tourists in the district. L: Oh I see. I“m so glad someone is doing something about publicizing the problem. M: Now how long can I keep the books for? L: Well, as you know, our normal loan period is three weeks with

44、 a two-week extension over the phone. However, in cases where we send books out by post we allow a longer initial loan period to allow for the delivery time. So you may have the books for six weeks from the date of postage. But I“m afraid the two weeks extension won“t apply then. However you would b

45、e able to renew by bringing them in for stamping, provided no one else has a reservation on them. M: I should think the normal period will be enough. Anyway I have to hand in the article within a month. Now how do you prefer the postage and photocopy fees to be paid? What is the probable relationshi

46、p between the two speakers? 解析 信息题。询问两位讲话者的关系。从录音开始处的 L: Good morning, City Central Library. May I help you? 和 M: Yes, I want to order some books please. 即可判断男士打电话去图书馆借阅书籍，接电话的女士是管理员。因此答案是 C。A.L9231358.B.L9321185.C.L9231385. D.L9213835.解析：听力原文 What“s the man“s membership number? 解析 信息题。管理员问 And your

47、 membership number?男士回答 That“s L 9231385. 所以 C是答案。考生如果没有准确记录，选项 A、B、D 容易成为迷惑答案。A.15 Lonkon Street, Annandale. B.50 Lonkon Street, Annandale.C.51 Lonkon Street, Annandale.D.15 London Street, Annandale.解析：听力原文 What is the address of the man? 解析 信息题。管理员询问男士的地址，男士回答 It“s 15 Lonkon Street, Annandale. 所以答

48、案是A。此选项容易和选项 D混淆。A.Description of the district.B.Environmental protection. C.Important reports in Australia.D.Australian government.解析：听力原文 What is the main content of the man“s article? 解析 推理题。四个选项在对话中都出现过，需要根据题意排除干扰项，选择正确的一个。当管理员询问男士借书的目的时，他回答道：I“m preparing an article for the environment watch section of the local newspaper.