高三英语词汇精讲：第四讲 数词.doc

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高三词汇精讲第四讲数词
知识点归纳
Ⅰ.基数词
表示数目的词为基数词，注意其写法
1-20：one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve
thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen，twenty
Ⅱ.序数词
1.序数词的写法
1-19：各基数词尾加th(其中七个例外：first,second,third,fifth,eighth,ninth,twelfth)
20,30~90:把y变i后加eth(twentieth,fortieth,ninetieth)
21以后多位数:最后一个数用序数词，其余用基数词(21st—twenty-first,110th—onehundredandtenth)
2.序数词的用法
表示第几个时，序数词前面加定冠词；如表示“又一，再一”，前面加不定词：thethirdchapter第三章；athirdchance又一个机会
Ⅲ.数词的用法
1.英语中年月日、点钟、序数词、分数词、算式列表
2.不定数量词“多”的表示法
Ⅳ.倍数表达法
倍数+as+形容词+as…
Wehaveproducedthreetimesasmanycomputersaswedidlastyear.
倍数+as+the+名词+of…
ChinaisalmosttwicethesizeoftheMexicoinarea.
倍数+what从句…
Thelengthoftheroadistwicewhatitwasthreeyearsago.
倍数+比较级+than…
HehasthreetimesmorebooksthanIhave.
比较级+than…+by+倍数程度…
Thelineislongerthanonebytwice.随堂练习
1.Two__diedofcoldlastwinter.
A.hundredsoldpeopleB.hundredoldpeople
C.hundredsoldpeoplesD.hundredoldpeoples
2.Hewasonlyin__atthetime.
A.his20'sB.the20'sC.histwentiesD.thetwenties
3.Thetwogreatmenwrotethoselettersin__.
A.1870'sB.1879sC.the1870'sD.the1870
4.IwonderifIcanaskhim__time.
A.fourB.fourthC.thefourthD.afourth
5.MrSmith___metobuyseveral__eggsforthedinner.
A.asked,dozenB.suggested,dozensof
C.had,dozenD.persuaded,dozensof
6.Itwasin1939that__brokeout.
A.WorldWarSecondB.theSecondWorldWar
C.SecondWorldWarD.WorldWarII
7.You'llhavetospend__writingyourreporthere.
A.onedayortwodaysB.onedayortwo
C.adayortwoD.twodaysorone
8.Hecutthecake__.
A.inhalvesB.inhalfC.intohalvesD.intohalf
9.Theearthisnearly__themoon.
A.50timethesizeofB.50timesthesizeof
C.50timesassizeasD.50timesasthatof
10.Inthesummercamp,therewere______boys.
A.threetimesasmanygirlsasB.asmanythreetimesgirlsas
C.threetimesgirlsasmanyasD.asmanygirlsasthreetimes
11.__ofthepopulationherearepeasants.
A.20percentsB.20percentC.the20percentD.the20percents
12.It'sabout__,thethicknessofahumanhair.
A.two-fifteenthB.two-fifteenthsC.twofifteenD.twofifteens
13.Thepriceof