2014高考英语 语法专项复习 第13讲 数词素材.rar

-2-第13章数词一.概念:数词分两类:基数词和序数词.表示数目的词叫基数词,表示须序的词叫序数词.二.相关知识点精讲1.基数词1）基数词一般可写成如345或threehundredandforty-five。2）基数词一般是单数形式，但遇下列情况，常用复数：a.与of短语连用，表示概数，不能与具体数目连用，如scoresofpeople指许多人；b.在一些表示"一排"或"一组"的词组里。例如：Theyarrivedintwosandthrees.他们三三两两的到了。c.表示"几十岁"。d.表示"年代"，用in+the+数词复数。e.在乘法运算的一种表示法里，如Threefivesis（are）fifteen。2.序数词序数词的缩写形式如first---1stsecond---2ndthirty-first---31st等。3.数词的用法1）倍数表示法a.主语+谓语+倍数（或分数）+as+adj.+as。例如Ihavethreetimesasmanyasyou.我有你三倍那么多。b.主语+谓语+倍数（分数）+thesize（amount，length…）of…。例如：Theearthis49timesthesizeofthemoon.地球是月球的49倍。c.主语+谓语+倍数（分数）+形容词（副词）比较级+than…。例如：Thegrainoutputis8percenthigherthisyearthanthatoflastyear.今年比去年粮食产量增加8%。d.还可以用by+倍数，表示增加多少倍。例如：Theproductionofgrainhasbeenincreasedbyfourtimesthisyear.今年粮食产量增加了4倍。2）分数表示法的构成：基数词代表分子，序数词代表分母。分子大于1时，分子的序数词用单数，分母序数词用复数。例如：1/3one-third；3/37threeandthree-sevenths.三.巩固练习1.______martyrshaveheroicallylaiddowntheirlivesforthepeople.a.Thousanduponthousandofb.Thousandandthousandsofc.Thousandsuponthousandsofd.Thousandandthousandof2.Theyreceived______oflettersabouttheirTVprograms.a.dozenb.dozenanddozencscored.dozens3.Whoisthatman,______inthefrontrow?a.oneb.theonec.firstd.thefirst4.Wehaveproduced______thisyearaswedidin1993.a.asmuchcottontwiceb.astwicemuchcottonc.muchastwicecottond.twiceasmuchcotton5.Theearthisabout______asthemoon.a.asfiftytimebigb.fiftytimesasbigc.asbigfiftytimed.fiftyastimesbig6.ThepopulationofmanyAlaskancitieshas______inthepastthreeyears.a.morethandoubledb.moredoubledthanc.muchthandoubledd.muchdoubledthan7.Themoonisabout_____indiameterasdiameterastheearth.a.one-threeaslargeb.onethreeaslargec.one-thirdaslarged.onethirdaslarge8.Fivehundredyuanamonth_____enoughtoliveon.a.isb.arec.isbeingd.hasbeen9.______ofthebuildingswereruined.a.Threefourthb.Threefourc.Three-fourthsd.Three-four10.Consult_____forquestionsaboutearthquakes.a.thesixindexb.indexsixc.sixthindexd.indexnumberingsix四.答案CDDDBACACB