雅思阅读读题时需要注意的考点

雅思阅读读题时需要注意的考点
雅思阅读读题时需要注意的考点

雅思阅读读题时需要注意的考点

朗阁海外考试研究中心

结合近期的雅思阅读考试、剑桥雅思真题集4-9、以及《雅思OG》,笔者在本文中将总结之前的考试规律、展望未来的考试趋势,给众多雅思考生呈现一些雅思阅读考试中常见的考点,让大家对雅思阅读有一个全新的认识,争取在考试中获得高分。

雅思考试是剑桥大学考试委员会(UCLES,全称University of Cambridge Local Examinations Syndicate,又译成剑桥大学认证中心)所给出的一个语言能力测试,其中的阅读测试只是测试考生对字面的阅读理解能力,不会对文章背后的深层内容作仔细的考查。所以在这样一种限制的情况之下,只要付出一定的努力,对考试内容作一个系统总结,一定可以把这种考试的常见考点(即测试规律)概括出来。下面是笔者通过多年的教学经验,总结出来的一些雅思阅读考试的规律:

从大的方面入手,这项考试要做的事情就两件:定位和判断。定位指的是找到每一道题目在文章中精确的对应句;判断指的是将题目在文章中定位后,根据文章的内容细节确定题目的答案。每一位考生面对考题的时候,不管是先读文章,还是先读题目,都要利用这两步来把题目做对。定位时要对雅思阅读中常见的十二种类型的题目顺序有一个非常细致的了解,定位之后的判断要对文章中对应的句子认真阅读,仔细对比题目和文章的对应关系,从而确定题目的答案。任何一位考生要想拿到自己期望的高分都要从这两方面入手。

下面根据笔者的经验,从读题时需要注意的方面入手概述一下在读到哪些内容时要特别注意,因为那些地方非常容易出现考点。

读题目时特别要注意的考点:

1、题目中的数据词

如果题目中出现了“statistical, statistics, cost, fund, large number, percent, percentage”等的时候,文章中相对应的句子会出现相对应的与数据相关的词。下面看几个例子:

例子一:

剑5 TEST 1 Passage 1 Q1 多项选择选项C. It was famous because of the large number of people involved. 题目中出现了数据词“large number”,根据这个词在文章中找与题目意思有关的句子,并且其中有可能包括数据。在文章中第5段找到这么一句话:“He was also helped by six assistants, two of whom died whilst the Dictionary was still in preparation.”根据两句话的意思,“6个助手”不算一个比较大(large number)的数据,所以这个选项是不对的。

例子二:

剑5 TEST 1 Passage 2 Q17 “the expected statistical outcome”,是一个“段落细节”题,让考生找这句话在文章中哪一段出现。题目有一个非常明显的数据词“statistical”,根据猜测,文章中相对应的句子可能会出现数据。文章中D段:“Prior to carrying out the experiment, Milgram explained his idea to a group of 39 psychiatrists and asked them to predict the average percentage of people in an ordinary population who would be willing to administer the highest shock level of 450 volts. ...... The psychiatrists felt that 'most subjects would not go beyond 150 volts' and they further anticipated that only four per cent would go up to 300 volts. Furthermore, they thought that only a lunatic fringe of about one in 1,000 would give the highest shock of 450 volts.”。文章中的数据“only four per cent”和“one in 1,000”对应了题目中的“statistical”,同时,文章中的“predict the average percentage of people”与题目中的“expected statistical outcome”相对应,所以这道题对应的句子应该是这段话。

例子三:

剑7 TEST 2 Passage 2 Q14 “a cost involved in purifying domestic water”,这道题同样是一道“段落细节”题,让考生找出这句话在文章中哪一段出现。题目中的数据词是“cost”,文章中应该会出现一些与“钱和数据”有关的词,在文章中可以非常明显地看到

E段有很多数据:“The costs included: £120m for removal of pesticides; £16m for removal of nitrates; £55m for removal of phosphates and soil; £23m for the removal of the bug cryptosporidium from drinking water by water companies.”而判断的时候发现文章中的“drinking water(饮用水)”与题目中的“domestic water(家庭用水)”相对应,所以此题对应的就是文章的E段。

2、题目中的时间词

如果题目中出现了与“最初(previous, original, originally, initial, initially, beginning, before, at first...)”、“最后(at last, later, end, finally, ultimately, eventually...)”和“现在(now, these days, current, currently, our time, with us...)”有关的词,因为题目和文章内容的一致性,所以文章中也会出现相对应的词。

例子一:

剑5 TEST 2 Passage 3 Q28 “In Europe, modem science emerged at the same time as the nation state. At first, the scientific language of choice remained __________.”题目中有一个时间词“at first(最初)”,到文章中找与前面相关的时间词,在文章第5段有这样一句话:“There were several reasons why original science continued to be written in Latin.”清晰地出现了时间词“original”,根据这句话意思,题目应该填“Latin”。

例子二:

剑9 TEST 3 Passage 3 Q32 “a reference to what Shannon initially intended to achieve in his research”,是一道“段落细节”题,是整个雅思考题中最难的题目。根据定位词“Shannon”和时间词“initially”,在文章C段第一句(This all seems light years away from the down-to-earth uses Shannon originally had for his work, which began when he was a 22-year-old graduate engineering student at the prestigious Massachusetts Institute of Technology in 1939.)里看到了定位词“Shannon”和时间词“originally”,再仔细读句子的意思,两句话的意思对应得很紧密。所以此题应该选择C段。

例子三:

剑9 TEST 1 Passage 1 Q10 “What was the name finally used to refer to the first colour Perkin invented”,题目中的时间词是“finally”,而文章第8段中相对应句子是“Perkin originally named his dye Tyrian Purple, but it later became commonly known as mauve (from the French for the plant used to make the colour violet)”,题目中“finally”的时间对应词是“later”。

3、题目中的并列、因果、转折词

还是因为题目和文章意思的一致性,题目中的逻辑关系在文章中一般也会出现,出现最多的是“并列关系”、“因果关系”和“转折关系”。

1)并列关系词:and, as well as, first...second..., either...or..., neither...nor...

例子一:

剑九 TEST 1 Passage 1 Q4 “Perkin was still young when he made the discovery that made him rich and famous.”,题目中出现了并列关系“rich and famous”,根据定位词“Perkin、young、discovery”,在文章中找到的对应句子是第3段中的:“Perkin's scientific gifts soon caught Hofmann's attention and, within two years, he became Hofmann's youngest assistant. Not long after that, Perkin made the scientific breakthrough that would bring him both fame and fortune.”,文章中出现了并列关系:“fame and fortune”,根据同义替换关系,“fame”对应“famous”、“fortune”对应“rich”。这是一道判断题,所以这道题应该选择“TRUE”。

例子二:

剑7 TEST 4 Passage 1 Q13 “In addition, over two thousand years ago kites were used in China as weapons, as well as for sending 13”,题目中的并列关系是“as well as”,这个短语的意思相当于“and”,所以根据顺序原则,在文章中第8段最后一句话中找到了并列关系“and”,文章的原句是:“other ancient civilisations certainly knew about kites; as early as 1250 BC, the Chinese were using them to deliver messages and dump flaming

debris on their foes.”,题目中的时间词“over two thousand years ago”也和文章中的“early as 1250 BC(早在公元前1250年)”形成了很好的时间对应关系,另外就是动词的同义替换:题目中的“sending”和文章中的“deliver(递送)”相对应。所以第13题应该填“messages”。

例子三:

剑5 TEST 2 Passage 3 Q30&31 “In Britain, moreover, scientists worried that English had neither the 30 nor the 31 to express their ideas.”题目中出现了一组否定并列关系词“neither...nor...”,所以文章中也会出现类似的并列关系,通过填空题的顺序原则和题目中的定位词“In Britain”,在文章第7段找到了否定并列关系句:“English was not well equipped to deal with scientific argument. First, it lacked the necessary technical vocabulary. Second, it lacked the grammatical resources required to represent the world in an objective and impersonal way, ...”,文章中的并列关系是“first..., second...”,而表示否定意思的词“lack(缺少)”正好与题目中的“neither...nor...”对应。

2)因果关系词:because, because of, since, as, for, due to, account for, reasoning, explain, attribute to

例子一:

剑7 TEST 1 Passage 1 Q11 “Radar is an inaccurate term when referring to bats because are not used in their navigation system.”,题目中出现了“因果”关系词“because”,文章中也会出现相应的“因果”关系。根据填空题的顺序原则,在文章最后一段话发现了相应的因果关系句“It is technically incorrect to talk about bat 'radar', since they do not use radio waves.”,通过仔细读文章中句子的意思,会发现非常明显的意思对应关系,而且出现了因果关系词“since”,所以第11个空填“radio waves”。

例子二:

剑7 TEST 1 Passage 2 Q22 判断题:“Feeding increasing populations is possible due primarily to improved irrigation systems.”题目本身的因果关系在文章中的对应关系

是第二段的句子:“Food production has kept pace with soaring populations mainly because of the expansion of artificial irrigation systems that make possible the growth of 40% of the world's food.”。题目中的“due...to...”与文章中的“because of”相对应,在意思上也有非常紧密的联系,所以这道题选择“YES”。

3)转折关系词:

但是、然而类:but, however, nevertheless(nonetheless), whereas, yet;

虽然、尽管类:although, even though, even if, despite, in spite of, while;

相反类:conversely, by(in) contrast, on the contrary, on the other hand

例子一:

剑5 TEST 2 Passage 3 Q33&34 “Although English was then overtaken by 33, it developed again in the 19th century as a direct result of the 34”,题目中有明显的转折关系“although”,所以根据顺序原则和定位词“19th century”,找到文章最后一段话:“It (German) is estimated that by the end of the 18th century 401 German scientific journals had been established as opposed to 96 in France and 50 in England. However, in the 19th century scientific English again enjoyed substantial lexical growth as the industrial revolution created the need for new technical vocabulary,...”,题目中“although”后面“33题”所在句子的内容正好和文章中“however”之前的部分相对应;而“34题”所在句子与文章中“however”之后的部分相对应,根据意思的对应关系,33题应该填“German”,34题应该填“industrial revolution”。

雅思阅读TFNG模拟试题(4)

雅思阅读TFNG模拟试题(4) Practice 4?? Para 1.?玊he need for a satisfactory education is more important than ever before. Nowadays, without a qualification from a reputable school or university, the odds of landing that plum job advertised in the paper are considerably shortened. Moreover, one's present level of education could fall well short of future career requirements.?お? para 2.?獻t is no secret that competition is the driving force behind the need to obtain increasingly higher qualifications. In the majority of cases, the urge to upgrade is no longer the result of an insatiable thirst for knowledge. The pressure is coming from within the workplace to compete with ever more qualified job applicants, and in many occupations one must now battle with colleagues in the reshuffle for the position one already holds.?お? para 3.?玈triving to become better educated is hardly a new concept. Wealthy parents have always been willing to spend the vast amounts of extra money necessary to send their children to schools with a perceived

2015年雅思阅读模拟试题及答案解析三

Time to cool it 1 REFRIGERATORS are the epitome of clunky technology: solid, reliable and just a little bit dull. They have not changed much over the past century, but then they have not needed to. They are based on a robust and effective idea--draw heat from the thing you want to cool by evaporating a liquid next to it, and then dump that heat by pumping the vapour elsewhere and condensing it. This method of pumping heat from one place to another served mankind well when refrigerators' main jobs were preserving food and, as air conditioners, cooling buildings. Today's high-tech world, however, demands high-tech refrigeration. Heat pumps are no longer up to the job. The search is on for something to replace them. 2 One set of candidates are known as paraelectric materials. These act like batteries when they undergo a temperature change: attach electrodes to them and they generate a current. This effect is used in infra-red cameras. An array of tiny pieces of paraelectric material can sense the heat radiated by, for example, a person, and the pattern of the array's electrical outputs can then be used to construct an image. But until recently no one had bothered much with the inverse of this process. That inverse exists, however. Apply an appropriate current to a paraelectric material and it will cool down. 3 Someone who is looking at this inverse effect is Alex Mischenko, of Cambridge University. Using commercially available paraelectric film, he and his colleagues have generated temperature drops five times bigger than any previously recorded. That may be enough to change the phenomenon from a laboratory curiosity to something with commercial applications. 4 As to what those applications might be, Dr Mischenko is still a little hazy. He has, nevertheless, set up a company to pursue them. He foresees putting his discovery to use in more efficient domestic fridges and air conditioners. The real money, though, may be in cooling computers. 5 Gadgets containing microprocessors have been getting hotter for a long time. One consequence of Moore's Law, which describes the doubling of the number of transistors on a chip every 18 months, is that the amount of heat produced doubles as well. In fact, it more than doubles, because besides increasing in number,the components are getting faster. Heat is released every time a logical operation is performed inside a microprocessor, so the faster the processor is, the more heat it generates. Doubling the frequency quadruples the heat output. And the frequency has doubled a lot. The first Pentium chips sold by Dr Moore's company,Intel, in 1993, ran at 60m cycles a second. The Pentium 4--the last "single-core" desktop processor--clocked up 3.2 billion cycles a second. 6 Disposing of this heat is a big obstruction to further miniaturisation and higher speeds. The innards of a desktop computer commonly hit 80℃. At 85℃, they

2014年雅思阅读模拟试题及答案解析(6)

1. A European spacecraft took off today to spearhead the search for another "Earth" among the stars. 2. The Corot space telescope blasted off aboard a Russian Soyuz rocket from the Baikonur cosmodrome in Kazakhstan shortly after 2.20pm. 3. Corot, short for convection rotation and planetary transits, is the first instrument capable of finding small rocky planets beyond the solar system. Any such planet situated in the right orbit stands a good chance of having liquid water on its surface, and quite possibly life, although a leading scientist involved in the project said it was unlikely to find "any little green men". 4. Developed by the French space agency, CNES, and partnered by the European Space Agency (ESA), Austria, Belgium, Germany, Brazil and Spain, Corot will monitor around 120,000 stars with its 27cm telescope from a polar orbit 514 miles above the Earth. Over two and a half years, it will focus on five to six different areas of the sky, measuring the brightness of about 10,000 stars every 512 seconds. 5. "At the present moment we are hoping to find out more about the nature of planets around stars which are potential habitats. We are looking at habitable planets, not inhabited planets. We are not going to find any little green men," Professor Ian Roxburgh, an ESA scientist who has been involved with Corot since its inception, told the BBC Radio 4 Today programme. 6. Prof Roxburgh said it was hoped Corot would find "rocky planets that could develop an atmosphere and, if they are the right distance from their parent star,they could have water". 7. To search for planets, the telescope will look for the dimming of starlight caused when an object passes in front of a star, known as a "transit". Although it will take more sophisticated space telescopes planned in the next 10 years to confirm the presence of an Earth-like planet with oxygen and liquid water, Corot will let scientists know where to point their lenses.

雅思阅读模拟试题及答案解析(2)

雅思阅读模拟试题及答案解析(2)

Next Year Marks the EU's 50th Anniversary of the Treaty A. After a period of introversion and stunned self-disbelief,continental European governments will recover their enthusiasm for pan-European institution-building in . Whether the European public will welcome a return to what voters in two countries had rejected so short a time before is another matter. B. There are several reasons for Europe’s recovering self-confidence. For years European economies had been lagging dismally behind America (to say nothing of Asia), but in the large continental economies had one of their best years for a decade, briefly outstripping America in terms of growth. Since politics often reacts to economic change with a lag,’s improvement in economic growth will have its impact in , though the recovery may be ebbing by then. C. The coming year also marks a particular point in a political cycle so regular that it almost seems to amount to a natural law. Every four or five years, European countries take a large stride towards further integration by signing a new treaty: the Maastricht treaty in 1992, the Treaty of Amsterdam in 1997, the Treaty of Nice in . And in they were supposed to ratify a European constitution, laying the ground for yet more integration—until the calm rhythm was rudely shattered by French and Dutch voters. But the political impetus to sign something every four or five years has only been interrupted,not immobilised, by this setback. D. In the European Union marks the 50th anniversary of another treaty—the Treaty of Rome, its founding charter. Government leaders have already agreed to celebrate it ceremoniously, restating their commitment to “ever closer union” and the basic ideals of European unity. By itself, and in normal circumstances, the EU’s 50th-birthday greeting to itself would be fairly meaningless, a routine expression of European good fellowship. But it does not take a Machiavelli to spot that once governments have signed the declaration (and it seems unlikely anyone would be so uncollegiate as to veto

学为贵:雅思阅读考点词

学为贵整理雅思阅读考点词雅思阅读考点词,可以留作备用。 resemble similar adjust modify shift alter approach method fundamental rudimentary preliminary basic rely on depend on domestic local national measure calculate assess evaluate trait characteristic feature property coin invent artificial synthetic man-made prompt initiate immediately exchange share apply underline based on ground root

ignore neglect overlook underestimate fertilizer chemical toxic unnatural recognize perceive acknowledge realize appreciate admit identify comprehend addition besides whereas nonetheless nevertheless notwithstanding although though instead stem derive owing due according account result therefore hence ————————————————————————————diversity variety difference detect find look for seek search isolate inaccessible avoid escape evitable budget fund financial adapt fit suit alternative substitute compensate make up offset component proportion

雅思阅读模拟试题-音乐

雅思阅读模拟试题:音乐 Background music may seem harmless, but it can have a powerful effect on those who hear it. Recorded background music first found its way into factories, shop and restaurants in the US. But it soon spread to other arts of the world. Now it is becoming increasingly difficult to go shopping or eat a meal without listening to music. To begin with, “ muzak ” (音乐广播网) was intended simply to create a soothing (安慰) atmosphere. Recently, however, it’s become big business –thanks in part to recent research. Dr. Ronald Milliman, an American marketing expert, has shown that music can boost sales or increase factory production by as much as a third. But, it has to be light music. A fast one has no effect at all on sales. Slow music can increase receipts by 38%. This is probably because shoppers slow down and have more opportunity to spot items they like to buy. Yet, slow music isn’t always answered. https://www.360docs.net/doc/9c11624482.html,liman found, for example, that in restaurants slow music meant customers took longer to eat their meals, which reduced overall sales. So restaurants owners might be well advised to play up-tempo music to keep the customers moving – unless of course, the resulting indigestion leads to complaints! ( )1. The reason why background music is so popular is that ______. A. it can have a powerful effect on those who hear it B. it can help to create a soothing atmosphere C. it can boost sales or increase factory production everywhere D. it can make customers eat their meals quickly ( )2. Background music means ________. A. light music that customers enjoy most B. fast music that makes people move fast C. slow music that can make customers enjoy their meals D. the music you are listening to while you are doing something ( )3. Restaurant owners complain about background music because ______. A. it results in indigestion B. it increases their sales C. it keeps customers moving D. it decreases their sales ( )4. The word “ up-tempo music” probably means_____. A.slow music B.fast music C.light music D.classical music

雅思阅读模拟试卷

ACADEMIC READING 60 minutes READING PASSAGE 1 You should spend about 20 minutes on Questions 1-13 which are based on Reading Passage 1 below. Striking Back at Lightning With Lasers Seldom is the weather more dramatic than when thunderstorms strike. Their electrical fury inflicts death or serious injury on around 500 people each year in the United States alone. As the clouds roll in, a leisurely round of golf can become a terrifying dice with death - out in the open, a lone golfer may be a lightning bolt's most inviting target. And there is damage to property too. Lightning damage costs American power companies more than $100 million a year. But researchers in the United States and Japan are planning to hit back. Already in laboratory trials they have tested strategies for neutralising the power of thunderstorms, and this winter they will brave real storms, equipped with an armoury of lasers that they will be pointing towards the heavens to discharge thunderclouds before lightning can strike. The idea of forcing storm clouds to discharge their lightning on command is not new. In the early 1960s, researchers tried firing rockets trailing wires into thunderclouds to set up an easy discharge path for the huge electric charges that these clouds generate. The technique survives to this day at a test site in Florida run by the University of Florida, with support from the Electrical Power Research Institute (EPRI), based in California. EPRI, which is funded by power companies, is looking at ways to protect the United States' power grid from lightning strikes. 'We can cause the lightning to strike where we want it to using rockets,' says Ralph Bernstein, manager of lightning projects at EPR!. The rocket site is providing precise measurements of lightning voltages and allowing engineers to check how electrical equipment bears up. Bad behaviour But while rockets are fine for research, they cannot provide the protection from lightning strikes that everyone is looking for. The rockets cost around $1,200 each, can only be fired at a limited frequency and their failure rate is about 40 per cent. And even when they do trigger lightning, things still do not always go according to plan. 'Lightning is not perfectly well behaved,' says Bernstein. 'Occasionally, it will take a branch and go someplace it wasn't supposed to go.' And anyway, who would want to fire streams of rockets in a populated area? 'What goes up must come down,' points out Jean-Claude Diels of the University of New Mexico. Diels is leading a project, which is backed by EPRI, to try to use lasers to discharge lightning safely and safety is a basic requirement since no one wants to put themselves or their expensive equipment at risk. With around $500,000 invested so far, a promising system is just emerging from the laboratory. The idea began some 20 years ago, when high-powered lasers were revealing. their ability to extract electrons out of atoms and create ions. If a laser could generate a line of ionization in the air all the way up to a storm cloud, this conducting path could be used to guide lightning to Earth, before the electric field becomes strong enough to break down the air in an uncontrollable surge. To stop the laser itself being struck, it would not be pointed straight at the clouds. Instead it would be directed at a mirror, and from

雅思阅读模拟试题精选

雅思阅读模拟试题精选

雅思阅读模拟试题精选 1. Washing, brushing and varnishing fossils — all standard conservation treatments used by many fossil hunters and museum curators alike —vastly reduces the chances of recovering ancient DNA. 2. Instead, excavators should be handling at least some of their bounty with gloves, and freezing samples as they are found, dirt and all, concludes a paper in the Proceedings of the National Academy of Sciences today. 3. Although many palaeontologists know anecdotally that this is the best way to up the odds of extracting good DNA, Eva-Maria Geigl of the Jacques Monod Institute in Paris, France, and her colleagues have now shown just how important conservation practices can be. This information, they say, needs to be hammered home among the

雅思阅读模拟试题及答案解析(4)

雅思阅读模拟试题及答案解析(4)

Selling Digital Music without Copy-protection Makes Sense A. It was uncharacteristically low-key for the industry’s greatest showman. But the essay published this week by Steve Jobs, the boss of Apple,on his firm’s website under the unassuming title “Thoughts on Music” has nonetheless provoked a vigorous debate about the future of digital music,which Apple dominates with its iPod music-player and iTunes music-store. At issue is “digital rights management” (DRM)—the technology guarding downloaded music against theft. Since there is no common standard for DRM, it also has the side-effect that songs purchased for one type of music-player may not work on another. Apple’s DRM system, called FairPlay, is the most widespread. So it came as a surprise when Mr. Jobs called for DRM for digital music to be abolished. B. This is a change of tack for Apple. It has come under fire from European regulators who claim that its refusal to license FairPlay to other firms has “locked in” customers. Since music from the iTunes store cannot be played on non-iPod music-players (at least not without a lot of fiddling), any iTunes buyer will be deterred from switching to a device made by a rival firm, such as Sony or Microsoft. When French lawmakers drafted a bill last year compelling Apple to open up FairPlay to rivals, the company warned of “state-sponsored piracy”. Only DRM, it implied, could keep the pirates at bay. C. This week Mr. Jobs gave another explanation for his former defence of DRM: the record companies made him do it. They would make their music available to the iTunes store only if Apple agreed to protect it using DRM. They can still withdraw their catalogues if the DRM system is compromised. Apple cannot license FairPlay to others, says Mr Jobs, because it would depend on them to produce security fixes promptly. All DRM does is restrict consumer choice and provide a barrier to entry, says Mr Jobs; without it there would be far more stores and players, and far more innovation. So, he suggests, why not do away with DRM and sell music unprotected?“This is

2018年雅思阅读模拟题及答案解析

2018年雅思阅读模拟题及答案解析(20) Don’t wash those fossils! Standard museum practice can wash away DNA. 1. Washing,brushing and varnishing fossils —all standard conservation treatments used by many fossil hunters and museum curators alike —vastly reduces the chances of recovering ancient DNA. 2. Instead,excavators should be handling at least some of their bounty with gloves,and freezing samples as they are found,dirt and all,concludes a paper in the Proceedings of the National Academy of Sciences today. 3. Although many palaeontologists know anecdotally that this is the best way to up the odds of extracting good DNA,Eva-Maria Geigl of the Jacques Monod Institute in Paris,France,and her colleagues have now shown just how important conservation practices can be. This information,they say,needs to be hammered home among the people who are actually out in the field digging up bones. 4. Geigl and her colleagues looked at 3,200-year-old fossil bones belonging to a single individual of an extinct cattle species,called an aurochs. The fossils were dug up at a site in France at two different times —either in 1947,and stored in a museum collection,or in 2004,and conserved in sterile conditions at -20 oC. 5. The team’s attempts to extract DNA from the 1947 bones all failed. The newly excavated fossils,however,all yielded DNA.

相关文档
最新文档