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专题四数词考点一基数词考点一基数词1—92.基数词的用法(1)在表示“几百、几千、几百万”等确切的数字时,直接用“基数词+hundred/thousand/million”;表示“成百、数千、上百万”等不确切的数字时,则用hun-dreds/thousands/millionsof表达。如:Therearetwohundredpeopleinthehall.大厅里有200个人。Therearehundredsofpeopleinthehall.大厅里有数以百计的人。(2)表示“不确切岁数或年代”用几十的复数形式,结构为“in+one's+整十的复数”,“in+the+年代-s”。如:Hebecameaprofessorinhisforties.他四十多岁时成了一名教授。Itwasinthe1960s.那是在20世纪60年代。(3)表示顺序。由“单数名词+基数词”构成,此时名词和基数词的第一个字母需大写。如:GradeNine九年级;Room105105房间考点二序数词基数词twenty-two注意:基数词变序数词口诀基变序,有规律,词尾常加-th;一、二、三特殊记,词尾字母t,d,d。八减t,九减e,f来把ve替。-ty结尾变-tie。若是遇上“几十几”,只变个位就可以。2.序数词的用法在使用序数词时,通常前面要加定冠词the;但是如果序数词前出现不定冠词a或an时,则表示“再一,又一”。如:We'llgooveritasecondtime.我们得再检查一遍。We'vetrieditthreetimes.Mustwetryitafourthtime?我们已经试过三遍了,还必须再试一次(第四次)吗?一、单句填空1.(2019广东)Weareproudofourcountry.Theyear2019isherseventieth(seventy)birthday.2.(2019黑龙江哈尔滨)—We'llcelebratetheseventieth(seventy)NationalDaythisyear.—That'sreallyexciting.3.(2019贵州铜仁)Therearenine(nine)floorsinthebuilding.Weliveontheninth(nine)floor.4.(2019甘肃天水)Twofifthsofthestudentsinourclassare(be)goingtothesummercampinBeijingnextweek.5.(2019甘肃兰州)Wegaveawaysixthousand(thousand)bookstotheschoollibrarylastyear.6.(2019湖北襄阳)—IsDongjinHigh-speedRailwayStationthesecond(two)largestinHubeiProvince?—Yes,ofcourse.It'sjustalittlesmallerthanthelargestoneinWuhan.7.(2019黑龙江齐齐哈尔)Wearepreparingprogramstocelebrateourcountry'sseventieth(seventy)birthday.8.(2018重庆)Thousands(thousand)ofvisitorscametotakephotosofHongyadongduringthevacation.9.(2018广东)Accordingtoasurvey,fouroutoffivewomendohouseworkathome,butonlytwofifths(five)ofmenwoulddoit.fourfifth/fourfifths/twofifth/10.(2018新疆乌鲁木齐)AnumberofpeoplepreferHUAWEIphones,andaboutfour-fifthsofthemare(be)adults.11.(2018山东青岛)It'smydaughter'sbirthdaytoday.She'seighteen(eigh-teenth)yearsold.12.(2018湖北黄冈)—Dad,aboutthreequarters(quarter)ofourclassmateswearglasses.—Oh,that'sterrible.Youallshouldtakegoodcareofyoureyes.13.(2017重庆)TodayisJack'sbirthday.Heisfourteen(fourteenth)yearsoldnow.二、语篇填空(2020河南中考预测)阅读短文,从方框中选择适当的词并用其正确形式填空,使短文意思通顺、完整。每空限填一词,每