2009年全国职称英语等级考试理工类(B级)试题及答案
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职称英语考试理工类B级试题及答案20XX年职称英语考试理工类B 级试题及答案20XX年职称英语考试理工类B级试题及答案第1部分:词汇选项(第1~15题,每题1分,共15分)下面共有15个句子,每个句子中均有1个词或短语画有底横线,请从每个句子后面所给的4个选项中选择1个与画线部分意义最相近的词或短语。
请将答案涂在答题卡相应的位置上。
1.Have you talked to her lately? A.lastly B.finally C.shortly D.recently2.While we don’t agree,we continue to be friendsA.whoever B.where C.Although D .Whatever3.Enormous sums of money have been spent on space exploration.A.Much B.Large C.Small D.Fixedt 4.About one million Americans are d iagnosed annually with skin cancer.A.every year B.severely C.actively D.every month11.The dentist has decided to extract her bad tooth.A.take out B.break off C.push in D.dig up12.The economy continued to exhibit signs of decline in September.A.play B.show C.send D.tell 13.This table is strong and durable.A.long-lasting B.extensiveC.far-reaching D.eternal14.He endured great pain before he finally expired.A.fired B.resigned C.died D.retreated 15.The girl is gazing at herself t he mirror.A.smiling B.laughing C.shouting D.staring第2部分:阅读判断(第16~22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.Mother Nature Shows Her StrengthTornadoes(龙卷风)and heavy thunderstorms moved across the Great Lakes and inc0 Trumbull County on Saturday evening.:The storms were dramatic and dangerous.George Snyder was driving the fire truck down Route 88 when he first noticed that a funnel (漏斗状的)cloud was behind him.“I stopped the truck and watched the funnel cloud.It was about 100 feet off the ground and I saw it go up and down for a while.It was moving toward Bradley Road and then suddenly it disappeared.”Snyder said.Snyder only saw one of the funnel clouds that passed through northeastern Ohio onSaturday.In Trumbull County, a tornado turned trees onto their sides.Sometrees feel onto houses and Cars.Other trees fell into telephone and electrical wires as they went down.Amanda Symcheck was having a party when the storm began.“I knew something was wrong,”she said.“I saw the sky go green andpink(粉红色).Then it sounded like a train rushing toward the house.I started crying and told everyone to go to the basement for protection.”The tornado caused a lot of damage to cars and houses in the area.It will take a long time and much money to repair everything.There was also serious water damage from me 也under storms.The heavy rains and high wind caused the power to go out in many homesThe storms caused serious flooding in areas near the river.More than four inches of rain fell in parts of Trumbull County.The river was so hight that the water ran into streets and houses.Many streets had to be closed to Cars and trucks because of the high water.’This made it difficult for fire trucks.police cars,and other rescue vehicles to help people who were in trouble.Many people who live near the river had to leave their homes for their own safety.Some people reported five feet of water in their homes.Local and state officials opened emergency shelters for thepeople who were evacuated(撤走).The Red Cross served meals to them.“T his was a really intense storm。
2009年全国职称英语等级考试(理工类C级)真题及详解第1部分:词汇选项(第1~15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个意义最为接近的选项。
1. I’d very much like to know what your aim in life is.A. thoughtB. ideaC. goalD. plan【答案】C【解析】句意:我很想知道你的人生目标是什么。
aim目标;目的。
goal目标。
二者意思相近,可相互替换。
thought和idea都是“思想、想法”的意思。
2. The policemen acted quickly because lives were at stake.A. in dangerB. in difficultyC. in despairD. out of control【答案】A【解析】句意:因为伤者生命垂危,所以警察迅速行动。
at stake在危险中;在紧要关头。
in danger在危险中。
二者意思相近,可相互替换。
in difficulty处于困难之中。
indespair处于绝望之中。
out of control失控。
3. Practically all animals communicate either through sounds or through soundless codes.A. CertainlyB. ProbablyC. AlmostD. Absolutely【答案】C【解析】句意:几乎,所有动物都是通过有声或无声代码进行交流的。
practically这个副词从词形上看是从形容词practical衍生而来,它固然有“在实践中”的意思,但practically这个副词的另一种常用的意思是almost,表“几乎”的意思。
二者意思相近,可相互替换。
certainly当然。
probably大概。
absolutely绝对地。
全国职称英语等级考试综合类B级历年真题及模拟试题详解全国职称英语等级考试(综合类B级)历年真题及模拟试题详解内容简介《全国职称英语等级考试(综合类B级)历年真题及模拟试题详解》是专门为提高考生参加全国职称英语等级考试(综合类B级)成绩而编写的复习资料。
其内容包括7套真题及详解(2009~2015年)和3套模拟试题及详解两部分。
真题详解部包括答案解析和全文翻译。
模拟试题及详解部分的试题遵循了最新考试大纲的考试内容和要求,后面附有参考答案及详解,具有很高的实用性和针对性。
•试看部分内容第一部分历年真题及详解2016年全国职称英语等级考试(综合类B级)真题及详解第1部分:词汇选项(第1~15题,每题1分,共15分)下面每个句子中均有1个词或者短语划有底横线,请为每处划线部分确定1个意义最为接近的选项。
1. All houses within 100 metres of the seas are at risk of flooding.A. out of controlB. between equalsC. in particularD. in danger【答案】D查看答案【解析】句意:距海100米内的所以房屋都有遭受洪水泛滥的危险。
at risk 处于危险中。
in danger处于危险中。
二者意思相近,可相互替换,因此选D项。
out of control失去控制。
in particular尤其,特别。
between equals相当。
2.The idea was quite brilliant.A. positiveB. cleverC. keyD. original【答案】B查看答案【解析】句意:这个主意相当巧妙。
brilliant聪明的;杰出的。
clever 聪明的,灵巧的。
二者意思相近,可相互替换,因此选B项。
positive积极的;确实的。
key关键的。
original原始的;最初的。
3. Stock market price tumbled after rumor of a rise in interest rate.A. regulatedB. fellC. increasedD. maintained【答案】B查看答案【解析】句意:谣传利率上升之后,股票市场价格猛跌。
全国职称英语等级考试全真模拟试题与答案解析_理工类_B级(一)第1部分:词汇选项(第1~15题,每题1分,共15分)下面共有15个句子,每个句子中均有1个词或短语划有底横线,请从每个句子后面所给的4个选项中选择1个与划线部分意义最相近的词或短语。
答案一律涂在答题卡相应的位置上。
1.The Group of Seven, a clique of Canadian artists painting at the turn of the century, has been credited with arousing a widespread awareness of Canada’s rugged landscape.A stimulatingB prolongingC glorifyingD encouraging 2.The term “composition” refers to the way the components of a drawing are arranged by the artist.A paintedB imaginedC put togetherD sharply perceived 3.Located in Washington, D.C, the Library of Congress contains an imposing array of books on every conceivable subject.A historyB catalogC shelfD collection 4.Acetate is one of the most important artificial fibers.A insulatingB syntheticC unadornedD complex 5.Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.A determinedB arguedC pretendedD hypothesized 6.Groundwater, a resource that exists everywhe re beneath the Earth’s surface, is under increasing risk from contamination and overuse.A popularizationB contractionC pollutionD industrialization 7.The ability to contemplate two contradictory thoughts at once is said to be a mark of genius.A hypotheticalB profoundC opposingD mathematical 8.What he said was contrariwise to what we expected.A ironicB innateC oppositeD circumspect9.The graduate students will convene in the Student Union.A converseB meetC summonD raze10.The new theory was corroborated.A confirmedB bleachedC hurledD refrained11.The five classic foot positions in ballet are the basis for the ethereal grace of the ballet dancer’sart.A balancedB traditionalC disciplinedD delicate12.Mol ly Brown was labeled “unsinkable” after she helped to evacuate passengers from the ill fated ship the Titanic.A anticipateB comfortC removeD shelter13.The painter Les Quinones, whose graffiti art has been exhibited in New York galleries, has also painted outdoor murals in various Manhattan neighborhoods.A soldB shownC keptD praised14.City dwellers are exhilarated by country air.A amazedB fannedC humbledD stimulated 15.Today in the United States, adult education facilities face rising demand created by expanding leisure time.A relaxinB structuredC increasingD unused第二部分:阅读判断(第16~22题,每题1分,共7分)阅读下面这篇短文,短文后列出7个句子,请根据短文的内容对每个句子做出判断。
xx年职称英语理工类B级考试题及答案下面每个句子中均有1个词或短语划有横线,请为每处划线局部确定1个意义最为接近的选项。
1. Have you talked to her lately?stlyB.finallyC.shortlyD.recently2. Can you follow the plot?A.changeB.investigateC.writeD.understand3. Jack eventually overtook the last truck.A.hitB.passedC.reachedD.led4. Sometimes it is advisable to book hotels in advance.A.possibleB.profitableC.easyD.wise5. The industrial revolution modified the whole structure of English society.A.destroyedB.brokeC.smashedD.changed6. Tickets are limited and will be allocated to, those who apply first.A.postedB.sentC.givenD.handed7. Loud noises can be irritating.A.confusingB.interestingC.stimulatingD.annoying8. That player is eternally arguing with the referee.A.desperatelyB.constantlyC.eventuallyD.extensively9. Mary has blended the ingredients.A.madeB.mixedC.cookedD.eaten10. They agreed to modify their policy.A.clarifyB.defineC.changeD.develop11. The high-speed trains can have a major impact on travel preferences.A.forceB.influenceC.surpriseD.power12. What is your glad in life?A.aimB.planC.arrangementD.idea13. Enormous sums of money have been spent on space exploration.A.MuchrgeC.SmallD.Fixed14. About one million Americans are diagnosed annually with skin cancer.A.every yearB.severelyC.activelyD.every month15. Her sister urged her to apply for the job.A.advisedB.causedC.forcedD.promised。
2009年职称英语考试理工类A 级真题+答案(7)D4Many economists have given in to the fatal lure of mathematics.A attractionB simplicityC powerD rigor5Ten years after the event, her death still remains a puzzle.A mistB fogC mysteryD secret6John was irritated by the necessity for polite conversation,A annoyedB troubledC angeredD aroused7Academic records cannot be duplicated.A borrowedB purchasedC rewrittenD copied8The emphasis on the importance of education has spurred scientific researchA fastenedB encouragedC raisedD initiated9We have ample money for the journeyA someB littleC extraD enough10 The doctor's pills worked marvels for me.A patientsB miraclesC illnessD recovery11 Mary's perpetual moaning nearly drove me mad.A monotonousB endlessC seriousD bitter12 It was hard to say why the man deserved such shabby treatmentA oldB unforgettableC funnyD unfair13 You didn't adhere to these principles.A followB orderC proveD handle14 The farmers also want to use the water to irrigate the barren land.A emptyB hairlessC bareD smooth15 Anyone who wants to apply for a loan need read the following specifications.A expressionsB warningsC instructionsD advertisements第2部分:阅读判断(第16~22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。
2009年职称英语考试理工类A 级真题+答案(7)2009年职称英语考试理工类A级真题+答案(7)第1部分:词汇选项(第1~15题,每题1分,共15分)下面每个句子中均有1个词或短语划有横线,请为每处划线部分确定1个意义最为接近的选项。
1Why can't you stop your eternal complaining?A everlastingB longC temporaryD boring2Hundreds of buildings were wrecked by the earthquake.A shakenB damagedC fallenD jumped3These paintings are considered by many to be authentic.A faithfulB royalC genuineD sincere4Many economists have given in to the fatal lure of mathematics.A attractionB simplicityC powerD rigor5Ten years after the event, her death still remains a puzzle.A mistB fogC mysteryD secret6John was irritated by the necessity for polite conversation,A annoyedB troubledC angeredD aroused7Academic records cannot be duplicated.A borrowedB purchasedC rewrittenD copied8The emphasis on the importance of education has spurred scientific researchA fastenedB encouragedC raisedD initiatedThirstier(渴的), with the result that freshwater is becoming increasingly scarce (缺乏). Half the world's wetlands have disappeared during the last century, while estimates suggest that water use will rise by 50% in the next 30 years.The World Bank report estimates that as much as half of the world's population, concentrated in Africa, the Middle East and south Asia, will face 'severe water shortages' by 2025. Local water conflicts and the loss of freshwater ecosystems appear large in some regions.A similar picture emerges from the globe's salt water regions. Three-quarters of the world's people may live within 100km of the sea in 2025, putting even more pressure on stretched coastal ecosystems. Two thirds of fisheries (渔业) are exploited at or beyond their sustainable limits, and half the world's coral reefs (珊瑚礁) may perish in 100 years. Almost 60% of coral reefsand 34% of fish species are at risk from human activities, the Bank says.The report concludes that there is ample evidence to justify immediate and coordinated action to safeguard supplies and use water more efficiently.Fresh water consumption is rising quickly, and the availability of water in some regions is likely to become one of the most pressing issues of the 21st century.A third of the world's population - around two billion people - live in countries that are experiencing moderate to high water shortages. That proportion could rise to half or more in the next 30 years unless institutions (制度) change to ensure better conservation and allocation of water.China is one country where the portents (征兆) are gloomy. The most water-stressed country in East Asia, China is exploiting 44% ofits usable water, a figure projected to rise to 60% by 2020. Primary withdrawal of water of more than 60% is widely considered by water experts to exceed the environmental carrying capacity of a river basin system. Although China's total use appears still to be reasonable, it has several basins that are severely stressed environmentally.Withdrawals exceed environmental limits in Afghanistan and Pakistan, and will exceed them in India by 2020. In the Middle East and North Africa, only Morocco has unexploited water resources. The rest have exceeded environmental limits and many are mining aquifers (蓄水层) - bodies of water-bearing rock - the report says.16It is estimated that water use will rise by 50% in the next 30 years.A RightB WrongC Not mentioned17Most developed countries will face water shortages in 20 years.A RightB WrongC Not mentioned18Most of the world's population may live within 100km of the sea in 2025.A RightB WrongC Not mentioned19Almost all coral reefs may disappear in 100 years.A RightB WrongC Not mentioned20Some species of fish in the Atlantic are at dangerously low levels.A RightB WrongC Not mentioned21The World Bank report implies that urgent action should be taken to protect water supplies.A RightB WrongC Not mentioned22India exceeds environmental limits for water use.A RightB WrongC Not mentioned第3部分:概括大意与完成句子(第23~30题,每题1分,共8分)下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段1选择个最佳标题;(2)第27~30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。
职称英语等级综合类(B级)试题考试试题、答案及题解92部分:阅读判断16 B Ireland is me best place in the world t0 live in for 2005,….爱尔兰是2005年世界上最适合居住的地方,……这是文章中的第一句话。
题干说的是:在长达2005年里,爱尔兰一直是世界上最适合于人类居住的地方。
因此,不对。
17 C 题干说的是:工作稳定是生活质量中最不重要的衡量标准。
文章第三段提到了工作稳定(job security),但是没有说工作稳定是生活质量中最不重要的衡量标准。
18 A 题干说的是:在爱尔兰生活费用相当高。
这一信息可以从第四段中的词组“the high cost of living”(很高的生活费用)中找到。
19 C 题干说的是:在津巴布韦,家庭生活不稳定。
文章没有提到。
20 A 题干说的是:爱尔兰名居榜首是因为它把新时期的的成分和一些好的传统结合在一起。
这一信息可以从第七段中找到。
21 B 题干说的是:评价生活质量很容易。
第八段是这么说的:The magazine admitted measuring quality of life is not a straightforward thing to do.该杂志承认评价生活质量不是一件简单的事。
因此,不对。
22 B 题干说的是:美国在前十名。
事实是它排在第十三名。
有关此信息可以在最后一段找到。
第3部分:概括大意与完成句子23 C 本文的标题是:即使是聪明人也会失败。
第二和第三段都跟Edison直接相关。
第二段描述的是他的发明创造。
24 D 本段是。
Edison对失败的看法。
第一句话的意思是:生活中的许多失败是半途而废,这些人不知道其实他们放弃时离成功已经是近在咫尺了。
25 A 本段的第一句话是这么说的:没有人喜欢失败,但是聪明的发明家会从中吸取教训。
注意:一个段落的第一句话常常是主题句。
26 B 本段的第一句话是这么说的:两个世纪来,发明家表现出的一个共同品质是弃而不舍。
2009年职称英语等级考试真题+答案-理工C 2009年度全国职称英语等级考试理工类(C级)真题及答案 人事考试教育网整理 201人 事 考 试 教 育 网 0-10-28 13:5 【大 中 小】【我要纠错】 第1部分:词汇选项(第1~15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个意义最为接近的选项。 1 I'd very much like to know what your aim in life is. A thought B idea C goal D plan 2 The policemen acted quickly because lives were at stake A in danger B in difficulty C in despair D out of control 3 Practically all animals communicate either through sounds or through soundless codes. A Certainly B Probably C Almost D Absolutely 4 Mary rarely speaks to Susan. A slowly B seldom C weakly D constantly 5 I'm working with a guy from London A teacher B student C friend D man 6 You'd better put these documents in a safe place A dark B secure C guarded D banned 7 The courageous boy has been the subject of massive media coverage. A extensive B continuous C instant D quick 8 The town is famous for its magnificent buildings A high-rise B modern C ancient D splendid 9 The great change of the city astonished all the visitors. A surprised B scared C excited D moved record A beats B maintains C matches D tries 第2部分:阅读判断(第16~22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 and by 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. 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 Libby's radiocarbon dating technique, 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 Earth's 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 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 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 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 When an organism dies, the C-14 in it begins to decay. A Right B Wrong C Not mentioned 22 The half-life of C-14 is about 25,000 years. A Right B Wrong C Not mentioned 第3部分:概括大意与完成句子(第23~30题,每题1分,共8分)
2009年度全国职称英语等级考试理工类(B级)试题 第1部分:词汇选项(第1~15题,每题1分,共15分) 下面每个句子中均有1个词或短语划有横线,请为每处划线部分确定1个意义最为接近的选项。 1 Would you please call my husband as soon as possible? A visit B phone C consult D invite 2 We had a long conversation about her parents. A speech B question C talk D debate 3 The chairman proposed that we stop the meeting. A stated B announced C demanded D suggested 4 Obviously these people can be relied on in a crisis. A lived on B depended on C believed in D joined in 5 There is always excitement at the Olympic Games when an athlete breaks a record. A beats B maintains C matches D tries 6 All the pupils seem to be very cheerful. A happy B healthy C naughty D busy 7 The traditional paintings are exhibited on the second floor. A laid B displayed C kept D stored 8 She stood there, shaking with fury. A misery B laughter C anger D cry 9 Mary evidently is the most diligent student among us A intelligent B beautiful C talkative D hardworking 10 Persistent attempts to interview Garbo were fruitless. A Forceful B Reasonable C Continuous D Firm 11 Why can't you stop your eternal complaining? A everlasting B long C temporary D boring 12 Hundreds of buildings were wrecked by the earthquake. A shaken B damaged C fallen D jumped 13 These paintings are considered by many to be authentic. A faithful B royal C genuine D sincere 14 Many economists have given in to the fatal lure of mathematics. A attraction B simplicity C power D rigor 15 Ten years after the event, her death still remains a puzzle A mist B fog C mystery D secret
第2部分:阅读判断(第16~22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 and by 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. 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 Libby's radiocarbon dating technique, 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 Earth's 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 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 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 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 25,000 years.