小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com选择性必修第三册UNIT9HUMANBIOLOGY(一)Ⅰ.阅读理解A(★)Chinesescientistsrecentlyhaveproducedtwomonkeyswiththesamegene，ZhongZhongandHuaHua，usingthesametechniquethatgaveusDollythesheep.Thesemonkeysarenotactuallythefirstprimates(灵长类)tobecloned.AnotheronenamedTetrawasproducedinthelate1990sbyembryo(胚胎)splitting，thedivisionofanearly-stageembryointotwoorfourseparatecellstomakeclones.Bycontrast，theywereeachmadebyreplacinganeggcellnucleus(原子核)withDNAfromadifferentiatedbodycell.ThisDollymethod，knownassomaticcellnucleartransfer(SCNT)，cancreatemoreclonesandallowsresearchersgreatercontrolovertheeditstheymaketotheDNA.Successcamefromadoptingseveralnewtechniques.Theseincludedanewtypeofmicroscopytobetterviewthecellsduringhandlingorusingseveralmaterialsthatencouragecellreprogramming，whichhadn’tbeentriedbeforeonprimates.Still，theresearchprocessproveddifficult，andmanyattemptsbytheteamfailed，justtwohealthybabymonkeysbornfrommorethan60testedmothers.Thisleadstomanyresearchers’pouringwaterontheideathattheteam’sresultsbringscientistsclosertocloninghumans.Theythoughtthisworkisnotasteppingstonetoestablishingmethodsforobtaininglivebornhumanclones.Instead，thisclearlyremainsaveryfoolishthingtoattempt，itwouldbefartooinefficient，fartoounsafe，anditisalsopointless.Butthescientistsinvolvedemphasizethatthisisnottheirgoal.Thereisnownobarrierforcloningprimatespecies，andthuscloninghumansisclosertoreality.However，theirresearchpurposeisentirelyforproducingnon-humanprimatemodelsforhumandiseases；theyabsolutelyhavenointention，andsocietywillnotpermitthisworktobeextendedtohumans.Despitelimitations，theytreatthisbreakthroughanovelmodelsystemforscientistsstudyinghumanbiologyanddisease.1．WhatdoweknowaboutthetechnologycalledSCNT?A．Itcreatedthefirsttwoprimates.B．ItmaycontributetoeditingtheDNA.C．Itcandivideanearly-stageembryointoseveralcells.D．Itproducedtwoclonedmonkeyswithdifferentgenes.2．Whatdoestheauthormeanby“pouringwaterontheidea”inparagraph2?A．Keepingahottopicofit.B．Attachingnoimportancetoit.小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.comC．Havingalowopinionofit.D．Addingsupportiveevidencetoit.3．Whatisthescientists’purposetoclonethesemonkeys?A．Topreparefortheirresearchonhumancloning.B．Toserveasasteppingstonetotheirreputation.C．Tohelpwiththestudyofhumandiseases.D．Toraisemoneyforholdinganexhibitionofnovels.4．Whatcanweinferfromthepassage?A．Cloninghumansisalreadyonitsway.B．Newtechniquesseemtobepointless.C．Societywon’tagreetocloneanothermonkey.D．Thesuccessrateofcloningamonkeywasnothigh.B(★)Fewbusinessescanrunwithoutcomputers，givingkeyboardshortcutsanincredibleimportance.Schoolsviewtypingcoursesasnecessary.Butwhatarewegivingupashandwritinglosesitssignificance?Brainpower，accordingtoscience.ResearchersfromPrincetonUniversityandtheUniversityofCaliforniaconductedaseriesofstudiestodemonstratethedifferencesbetweenstudentswhowroteouttheirnotesandthosewhotypedthem.Studyparticipantstooknotesonalectureusingoneofthetwomethodsandweretested30minutesafterthelecture，andagainaweeklater.Theresultsshowedbothtypesofnotetakersdidwellonthefirsttest.Thelongh...