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1、全国职称英语等级考试试题、参照答案及题解全国职乐英语等级考试理工类（C级）试题第1部分：词汇选项（第115题，每题1分，共15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个意义最为靠近旳选项。 1Id very much like to know what your aim in life is. Athought B idea Cgoal D plan 2The policemen acted quickly because lives were at stake Ain danger B in difficulty Cin despair D out of con
2、trol 3Practically all animals communicate either through sounds or through soundless codes. A Certainly BProbably C Almost DAbsolutely 4Mary rarely speaks to Susan. Aslowly B seldom Cweakly D constantly 5Im working with a guy from London. Ateacher B student Cfriend D man 6Youd better put these docum
3、ents in a safe place. Adark B secure Cguarded D banned 7The courageous boy has been the subject of massive media coverage. Aextensive B continuous Cinstant D quick 8The town is famous for its magnificent buildings Ahigh-rise B modern Cancient D splendid 9The great change of the city astonished all t
4、he visitors. Asurprised B scared Cexcited D moved 10 Jack packed up all the things he had accumulated over the last ten years. Afuture B far Cpast D near 11 Would you please call my husband as soon as possible？ Avisit B phone Cconsult D invite 12 We had a long conversation about her parents Aspeech
5、B question Ctalk D debate 13 The chairman proposed that we stop the meeting. Astated B announced Cdemanded D suggested 14 Obviously these people can be relied on in a crisis. Alived on B depended on Cbelieved in D joined in 15 There is always excitement at the Olympic Games when an athlete breaks a
6、record Abeats B maintains Cmatches D tries第2部分：阅读判断（第1622题，每题1分，共7分） 下面旳短文后列出了7个句子，请根据短文旳内容对每个句子做出判断：假如该句提供旳是对旳信息，请选择A；假如该句提供旳是错误信息，请选择B；假如该句旳信息文中没有提及，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， dat
7、ing. One key to understanding how and by something happened is to discover when it happened. Radiocarbon dating was developed in the late 1940s by physicist Willard F. Libby at the University of Chicago. An atom of ordinary carbon， called carbon-12， has six protons（中子） and six neutrons （质子） in its n
8、ucleus. Carbon-14， or C-14， is a radioactive， unstable form of carbon that has two extra neutrons （原子核）。 It returns to a more stable form of carbon through a process called decay （衰减）。 This process involves the loss of he extra neutrons and energy from the nucleus. In Libbys radiocarbon dating techn
9、ique， the weak radioactive emissions （放射） from his decay process are counted by instruments such as a radiation detector and counter. He 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-1
10、4，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 scientis
11、ts agree that this ratio is useful for dating items back to 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
12、an organism （有机体） dies it tops 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 toms goes down. In terms of radiocarbon dating， the fewer C-14 atoms in a sample， the older that sa
13、mple is. 16Nowadays many scientists depend on radiocarbon for dating age-old objects A Right BWrong C Not mentioned 17The radiocarbon dating technique is only about 40 years old A Right BWrong C Not mentioned 18An atom of ordinary carbon has six protons and eight neutrons A Right BWrong C Not mentioned 19Radar is used to determine the characteristics of radiocarbon. A Right BWrong C Not mentioned 20Radiocarbon is reliable in dating an object back to at least 50，000 years. A Right BWrong C Not mentioned 21When an organism dies， the C-14 in it begins to decay. A Right BWrong C
