- 1、本文档共72页,可阅读全部内容。
- 2、原创力文档(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
PAGE
PAGE1
tpo69三篇托福阅读TOEFL原文译文题目答案译文背景知识
TOC\o1-2\h\u4810阅读-1 2
13549原文 2
13243译文 5
1115题目 8
30030答案 15
23598背景知识 16
5078阅读-2 19
7090原文 19
23698译文 22
8650题目 25
18184答案 33
4938背景知识 34
27268阅读-3 41
8459原文 41
14406译文 45
13267题目 48
26721答案 55
21573背景知识 56
阅读-1
原文
WhySnakesHaveForkedTongues
①Theforkedtongueofsnakeshasintriguedpeopleformillennia,inspiringmanyhypotheses.Inmanyculturesandreligions,theforkedtonguesymbolizesmalevolenceanddeceit.ThefirstpersonknowntoinquireaboutthefunctionalsignificanceoftheforkedtonguewasAristotle;hesuggestedthatitwoulddoublethepleasureofsensationsoftaste.Bythebeginningofthetwentiethcentury,theconsensuswasthatthesnake’stongueisatactileorgan;thatis,thesnakeusesittotapthegroundmuchasablindpersonusesacane.
②In1920Browmansuggestedwhatseemedtobeawinninghypothesis:Whenthesnakeretractsitstongue,thetips(ortines)oftheforkedtongueareinsertedintoopeningsonbothsidesoftheroofofthemouth;throughtheseopeningschemicalstimulireachspecialorgansthathelpsnakesdetectsmells—thevomeronasalorgans(VNO).Theseorgansarehighlydevelopedinsnakes,lizards,andmanymammals.Theyareasecondsystemfordetectingsmellsthatappearstohaveevolvedspecificallytodetectpheromones,thechemicalsignalsthatanimalssecreteasmessagestootheranimalsoftheirspecies.Browmansuggestedthattheforkedtongueflicksout,pickingupchemicalsignals,andthendeliversthesetotheVNO.Thishypothesiswaswidelyacceptedintothe1980s.ThenX-raymoviestudiesoftongueflicksinsnakesandlizardswithforkedtonguesdisprovedthehypothesis;theyshowedthatwhenthetongueiswithdrawnintothemouth,itentersasheathandthetipsdonotgointotheopeningstotheVNO.Instead,thechemicalmoleculesaredepositedonpadsatthebottomofthemouth,and
您可能关注的文档
- tpo28三篇托福阅读TOEFL原文译文题目答案译文背景知识.docx
- tpo29三篇托福阅读TOEFL原文译文题目答案译文背景知识.docx
- tpo30三篇托福阅读TOEFL原文译文题目答案译文背景知识.docx
- tpo32三篇托福阅读TOEFL原文译文题目答案译文背景知识.docx
- tpo34三篇托福阅读TOEFL原文译文题目答案译文背景知识.docx
- tpo35三篇托福阅读TOEFL原文译文题目答案译文背景知识.docx
- tpo36三篇托福阅读TOEFL原文译文题目答案译文背景知识.docx
- tpo37三篇托福阅读TOEFL原文译文题目答案译文背景知识.docx
- tpo38三篇托福阅读TOEFL原文译文题目答案译文背景知识.docx
- tpo39三篇托福阅读TOEFL原文译文题目答案译文背景知识.docx
文档评论(0)