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高一牛津(AHW)第23期必修二Unit2综合检测题参考答案及部分解析参考答案1-5BCABC6-10CAABC11-15ACACB16-20BAACB21-25CCDDA26-30CBBDA31-35AABBA36-40EGCAF41-45BADAD46-50CBCAA51-55BDCBA56.from57.driven58.nervously59.pleased60.what61.tolearn62.hadstarted63.the64.beginners65.pride写作第一节Onepossibleversion:NOTICEAreyouanaerobicsloverandwanttokeepfitundertheguidanceofprofessionals?Now,wearehappytoannouncethatathree-monthaerobicsclasswillbeopentoyounextweekThecoursewillstartat6p.m.andlastforaboutonehoureachtime.Here,youcanperformarangeofaerobicmovesshowntoyoubyourprofessionalcoaches.Thecoacheswillpatientlyexplainandshoweverymovetopreventyoufromhurtingyourselves.You'refreetocheckouttheclassscheduleonourwebsite.Preparetosweatandhavefun!TheFitnessClub第二节Onepossibleversion:Then,Iknewwhathadhappenedtomyarticle.Atsomepointwhilemyarticlewasstillopenonmyscreen,Imusthavelefttheroom.WhileIwasaway,Cococameouttoplay!Hemusthavedoneahappydanceontheletter"n"andthenflownawaybeforeIreturned.WhenIdecidedtoclosethewindow,Ididsowithoutfirstcheckingmywork.So,Isaveditwithallthosen's.Nowonderthecompanyrefusedme!Ieditedmypiececarefully,thistimemakingsureitwasperfectbeforeclosingthewindow.Iwroteacovere-mailcontainingaheartfeltapologyandexplainedwhatIthoughthadhappened.AfterIsenttheletter,Iwonderedaboutmywisdom.Itreallydidsoundlikeanexcuse.However,itseemedtodothetrick.Afewdayslater,Isignedmyletterofacceptancetoworkwiththecompany.【补充说明】dothetrick奏效；起作用；达到目的部分解析阅读
分析由直线平行可得a-1-（-3）（a+1）=0，解方程排除重合即可．
解答解：∵两直线l1：（a-1）x-3y-10=0，l2：（a+1）x+y+3=0互相平行，
∴a-1-（-3）（a+1）=0，解得a=$-\frac{1}{2}$，
经验证当a=-$\frac{1}{2}$时，两直线平行．
故选：A．
点评本题考查直线的一般式方程和平行关系，属基础题．
