首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of th
In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of th
admin
2010-01-15
58
问题
In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are visible as depressed or elevated areas, ridges, or grooves, smooth or rough patches on the hard parts. The muscles most important for the activities of the animal and most evident in the appearance of the living animal are those attached to the hard parts and possible to reconstruct from their attachments. Much can be learned about a vanished brain from the inside of the skull in which it was lodged.
Restoration of the external appearance of an extinct animal has little or no scientific value. It does not even help in inferring what the activities of the living animal were, how fast it could run, what its food was, or such other conclusions as are important for the history of life. However, what most people want to know about extinct animals is what they looked like when they were alive. Scientists also would like to know. Things like fossil shells present no great problem as a rule, because the hard parts are external when the animal is alive and the outer appearance is actually preserved in the fossils.
Animals in which the skeleton is internal present great problems of restoration, and honest restorers admit that they often have to use considerable guessing. The general shape and contours of the body are fixed by the skeleton and by muscles attached to the skeleton, but surface features, which may give the animal its really characteristic look, are seldom restorable with any real probability of accuracy. The present often helps to interpret the past. An extinct animal presumably looked more or less like its living relatives, if it has any. This, however, may be quite equivocal. For example, extinct members of the horse family are usually restored to look somewhat like the most familiar living horses—domestic horses and their closest wild relatives. It is, however, possible and even probable that many extinct horses were striped like zebras. Others probably had patterns no longer present in any living members of the family. If lions and tigers were extinct they would be restored to look exactly alike. No living elephants have much hair and mammoths, which are extinct elephants, would doubtlessly be restored as hairless if we did not happen to know that they had thick, woolly coats. We know this only because mammoths are so recently extinct that prehistoric men drew pictures of them and that the hide and hair have actually been found in a few specimens. For older extinct animals we have no such clues.
According to the passage, the soft part of fossilized animals______.
选项
A、can always be accurately identified
B、have usually left some traces
C、can usually be reconstructed
D、have always vanished without any trace
答案
B
解析
本题询问细节。相关信息为文章的第一段,关键语句为“In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts.Many of them also were attached to the hard parts and usually such attachments are visible as depressed or elevat
转载请注明原文地址:https://kaotiyun.com/show/bTnK777K
0
专业英语四级
相关试题推荐
FiveCommonMistakesinConversationsandTheirSolutionsI.NotlisteningA.Problem:mostpeople【T1】________
(1)Therewasmusicfrommyneighbor’shousethroughthesummernights.Inhisbluegardensmenandgirlscameandwentlikemo
ThroughouttheU.S.studentsaregettingouttheirNo.2pencils,readyendureastress-packedfourhoursofbubblinginanswers
Womenaregettingunhappier,ItoldmyfriendCarl. "Howcanyoutell?"hedeadpanned."It’salwaysbeenwhine-whine-whine."
A、7,000studentsdropoutofschooleveryyear.B、Fewstudentsleaveschoolwithoutadiploma.C、About1millionstudentsdropo
Anarrowingofyourinterestsisimpliedinalmostanytransitionfromastudyenvironmenttomanagerialorprofessionalwork
Somepeoplesaylovemakestheworldgoaround.Otherssayitisnotlove;it’smoney.Sincethetruthisthatitisenergyt
PassageThree(1)Whichwouldyouprefertobe:amedievalmonarchoramodernoffice-worker?Thekinghasarmiesofservan
Inatimenotsolongagoorfaraway,eatingfamilydinner,connectingwithyourspouseaftertuckingthechildrenintobedor
Morethanfortythousandreaderstolduswhattheylookedforinclosefriendships,whatthe 【C1】______friends,whattheywere
随机试题
简述真菌性疾病的标本取材及制作方法和临床意义。
甲乙二人因租赁合同纠纷诉至法院,审判员对此案进行了调解,但未达成协议。于是法院开庭审理后当庭作出判决。在送达判决书之前,甲又要求法院进行调解,这时法院应当:()
[2004年第4题]编制土建分部分项工程预算时,需用下列哪种定额或指标?
中国注册会计师协会是我国注册会计师的行业自律组织,对注册会计师进行自律管理和约束。()
社会主义市场体系是由()构成的。
旅游行程开始前,旅游者将包价旅游合同中自身的权利义务转让给第三人,旅行社()。
某名人在微博上辱骂网友而被告上法庭,随后被判公开道歉并赔偿精神抚慰金。该事启示我们,必须()。
A、 B、 C、 D、 B题干中的五幅图形均由一种图形平移或缩放组成的复合图形,由此可知B选项正确。
WhilepopularintheU.S.,theAprilFool’sDaytraditionisevenmoreprevalentinEuropeancountries,suchasFranceandGre
WriteonANSWERSHEETTWOacompositionof200wordsonthefollowingtopic:WhatWouldYouLiketoDo
最新回复
(
0
)