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上期参考答案B1-B4版第二节1-5BAACC6-10ACBBA11-15CABCBOnepossibleversion:16-20CACAB21-25CCABD26-30BCCBAJustthen,thehomelessmanrushedtowardsthe31-35BADAD36-40FAGEB41-45BADDCwoman.Aftergettingtoher,hehelpedherpickupwhatshe46-50BABCC51-55BCADA56.difficulthadbought.Whiledoingit,hekeptcomfortingthewoman.57.saw58.theSecondslater,everythingreturnedtohercart.Then,heoffered59.which/thattohelppushthecarttohercar.Howthoughtfulhewas!The60.wasprovided61.toask62.seriouslywomanthankedhimalot.IlookeddownatScarlett,finding63.organisation64.years65.with/byshewasviewingitwithhermouthwideopen.Andsuddenly第一节sheopenedherwalletandpulledouthermoney.Onepossibleversion:"Mom,Iwantedtogivemymoneytohim,"shesaid.Myfavoriteteacherlookingupatme.Surprised,Iopenedthecardoor.ScarlettMr.Wang,whoteachesushistory,ismyfavoriteteacher.rantothehomelessman.JuneandIfollowed.AftergettingHeismorethanfiftyyearsoldandhehastheabilitytohim,Scarletthandedouthermoneyandsaid,"Sir,Iwanttomakeasubjectthatmanystudentsfindincrediblyboringtohelpyou."Surprisedandtouched,hesaid,"Really?"cometolifethroughhisenthusiasmforhistoryandhisloveScarlettnoddedhappily.Knowingwhatwasgoingon,theyoungwomanalsogavehimmoney.Themanwassoofbeingateacher.Inhislessons,historyissomethingthatthankful.Whenreturningtoourcar,Scarlettsaid,"Itfeelswecansee,hearandfeel,andwecanmakeitalivethroughgoodtohelpsomeone!"Weallsmiled.dressingupandactingoutscenes.Heisanamazingteacher.Ilovehimverymuch.本版主编张资清责编代瑞芝
分析把异面直线a，b平移到相交，使交点为A，若∠CAB=60°，则存在2个平面与两异面直线都成45°角，若∠CAB=120°，则不存在个平面与两异面直线都成45°角，即可得到答案．
解答解：把异面直线a，b平移到相交，使交点为A，
此时若∠CAB=60°，则存在2个平面与两异面直线都成45°角，
若∠CAB=120°，则不存在个平面与两异面直线都成45°角，
故选：B．
点评此题是个中档题．考查异面直线所成的角，以及解决异面直线所成的角的方法（平移法）的应用，体现了转化的思想和运动变化的思想方法．
