大学英语测试C卷(附答案).pdf

1 英语水平摸底考试（时间： 2 小时）C卷单位_ 姓名_ 第 1 部分：词汇选项(第 11 5 题，每题1 分，共 1 5 分 ) 下面每个句子中均有1 个词或短语划有底横线，请为每处划线部分确定1 个意义最为接近的选项1. UFO represents unidentified flying object. AA.stands forB.hints at C.implies D.indicates 2.He is determined to consolidate his power. AA.strenghthenB.control C.abandon D.exercise 3.One is supposed to eat a light meal before going to bed. BA.cheap B.small C.tasteful D.vegetarian 4. This kind of material was seldom used in building houses during the Middle Ages. AA.never B.rarely C.often D.only 5. It is virtually impossible to persuade him to apply for the job. BA. simply B. almostC. totally D.completely 2 6. Being colleagues for ten years, they have become intimate friends. AA.close B.new C.kind D.nice 7. Many scientists have been probing psychological problems. BA.solving B.exploringC.settling D.handling 8.Many problems that bothered people then continue to exit today. AA.disturbedB.destroyed C.endangered D.interested 9. This is not typical of English, but is a feature of the Chinese language. AA.particularB.characteristicC. remarkable D. idiomatic 10.Tom cannot afford a new car. AA.buy B.sell C.ride D.share 11.The idea of time is incorporated in all languages. BA.assigned B.includedC.indicated D.evidenced 12. We have never seen such gorgeous hills. AA.beautifulB.streching C.spreading D.rolling 3 13.We must tackle the problem of poverty as soon as possible. AA.handleB.disappear C.meet D.find 14.Hearing problems may be alleviated by changes in diet and exercise habits. DA.removed B.cured C.worsened D.relieved1 5. The government initiated a mass campaign to wipe out malaria in the area. CA.enhanced B.encountered C.started D.proposed 第 2 部分：阅读判断(第 1622 题，每题1 分，共 7 分) 下面的短文后列出了7 个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A;如果该句提供的是错误信息，请选择B;如果该句的信息文中没有提及，请选择C。

Radiocarbon Dating Nowadays scientists can answer many questions about the past through a technique called radiocarbon (放射性碳 ), or carbon-14, dating. One key to understanding how something happened is to discover when it happened. Radiocarbon dating was developed in the late 1940s by physicist Willard F. Libby at he University of Chicago. An atom of ordinary carbon, called carbon-12, has six protons(中子 ) and six neutrons (质子 ) in its nucleus( 原子核 ). Carbon-14, or C-14, is a radioactive, unstable form of carbon that has two extra neutrons. It returns to a more stable form of carbon through a process called decay (衰减 ). This process involves the loss of the extra neutrons and energy from the nucleus. In Libbys radiocarbon dating technique, the weak radioactive emissions (放射 ) from this decay process are counted by instruments such as a radiation detector and counter. The decay rate is used to determine the proportion of C-14 atoms in the sample being dated. Carbon-14 is produced in the Earths atmosphere when nitrogen (氮 )-14, or N-14,interacts with cosmic rays (宇宙射线 ). Scientists believe since the Earth was formed, the mount of nitrogen in the atmosphere has remained constant. Consequently, C-14 formation is thought to occur at a constant rate. Now the ratio of C-14 to other carbon toms in the atmosphere is known. Most scientists agree that this ratio is useful for dating items back to 4 at least 50,000 years. All life on Earth is made of organic molecules (分子 ) that contain carbon atoms coming from the atmosphere. So all living things have about the same ratio of C-14 atoms to other carbon atoms in their tissues (组织 ). Once an organism (有机体 ) dies, it stops taking in carbon in any form, and the C-14 already present begins to decay. Over time the amount of C-14 in the material decreases, and the ratio of C-14 to other carbon atoms goes down. In terms of radiocarbon dating, the fewer C-14 atoms in a sample, the older that sample is. 16. Nowadays many scientists depend on radiocarbon for dating age-old objects. A.Right B.Wrong C.Not mentioned 17. The radiocarbon dating technique is only about 40 years old. A.Right B.Wrong C.Not mentioned 18. An atom of ordinary carbon has six protons and eight neutrons. A.Right B.Wrong C.Not mentioned 19. Radar is used to determine the characteristics of radiocarbon. A.Right B.Wrong C.Not mentioned 20. Radiocarbon is reliable in dating an object back to at least 50,000 years. A.Right B.Wrong C.Not mentioned 21. The C-14 in an organism begins to decay when it dies. A.Right B.Wrong C.Not mentioned 22. The half-life of C-14 is about 2 5,000 years. A.Right B.Wrong C.Not mentioned 第 3 部分：概括大意与完成句子(第 2330 题，每题1 分，共 8 分) 下面的短文后有2 项测试任务：(1)第 2326 题要求从所给的6 个选项中为第2 5 段每段选择 1 个最佳标题 ;(2)第 2730 题要求从所给的6个选项中为每个句子确定1 个最佳选项。

Cloning(克隆 )：Future Perfect?1 A clone is an exact copy of a plant or animal produced from any one cell. Since Scottish scientists reported that they had managed to clone a sheep named Dolly in 1997 ， research into cloning has grown rapidly In May 1998 ， scientists in Massachusetts managed to create two identical calves(牛犊 ) using cloning technology. A mouse has also been cloned successfully. But the debate （争论）over。