专题五数 词,考点一基数词和序数词,(省卷：2023.80；北部湾经济区：2021.32；单项选择、选词填空),1.基数词的常见用法,2.基数词的特殊用法,(1)“another基数词名词复数”“基数词more名词复数”，表示在原有基础上再增加一定数量如：another two hours 再两小时two more cakes 再两块蛋糕,(2)表示时间、距离时，用含有基数词的名词所有格形式作定语如：ten minutes ride 十分钟的车程,(3)表示长、宽、高等时，用“基数词单位名词(inch,meter,foot等)形容词(long,wide,deep,tall等)”结构，或者用“基数词单位名词in名词(width,length,height等)”结构如：two meters wide two meters in width两米宽,(4)“基数词名词(形容词)”复合结构作定语时，名词要用单数形式，定语的各部分之间需用连字符“”来连接如：a threeyear study plan 一个三年学习计划,3.序数词的构成,(1)一般情况下，序数词多是由“基数词th”构成如：sixsixth；sevenseventh,(2)以y结尾的整十数字，先将y改为i，再加eth。
如：fiftyfiftieth；seventyseventieth,(3)21及以上的非整十的数字，将个位数改为序数词，其他的位数仍用基数词如：,twentyonetwentyfirst；two hundred and ninetyeighttwo hundred and ninetyeighth,(4)少数的基数词变序数词属于特殊情况，而且这类词也是常考点，考生要特别注意记忆如：,onefirst；twosecond；threethird；fivefifth；eighteighth；nineninth；twelvetwelfth,4.序数词的用法,(1)序数词表示顺序、日期时，前面要用定冠词the如：the fifth floor 五楼,(2)表达分数时，分子用基数词，分母用序数词分子是“1”时，分子、分母都用单数形式；分子大于“1”时，分母用复数形式如：one third 三分之一four fifths 五分之四,(3)表达“又一；再一”之意，用“a/an序数词单数名词”结构如：a third try 再试一次,(4)表示编号时既可以用序数词，也可以用基数词如：the thirtieth pagePage 30 第三十页,5.基数词变副词,由基数词变副词，最常见的只有两个，即：oneonce(一次；曾经)twotwice(两次；两倍),6.数学运算表达,用基数词表示常见四则运算，加号()为plus或and，减号()为minus，乘号()为times或multiplied by，除号()为divided by，等号()为be动词、make或equal。
1.(2021北部湾经济区32题改编)Chinas National Day comes in October,the,_,month of the year.,A.eighth B.ninth C.tenth,2.This will be my,_,visit to the Great Wall.Im so excited.,Really?I cant believe youve never been there yet.You arrived in Beijing almost a year ago!,A.first B.second C.third,3.Whats twenty and fifty?,Its,_,A.fifty B.seventy C.eighty,C,A,B,4.There are,_,months in a year,and Teachers Day in China is in the month.,A.twelve;nineth B.twelfth;nine,C.twelve;ninth,5.You should go to bed before 23：00 and get up at 7：00.Teenagers are supposed to have more than,_,hours sleep every night.,A.seven B.eight C.nine,6.Womens Day is the,_,day of March.,A.sixth B.seventh C.eighth,C,B,C,考点二概数的表达,(省卷：近2年未考查；北部湾经济区：20212022年未考查),1.表示确切的数：当基数词与hundred,thousand,million,billion连用时，其后不加s，也不带of，表示确切的概念。
如：eight hundred dollars 八百美元,2.表示不确切的数：当hundred,thousand,million,billion与of连用时，其前不加具体的基数词，其后加s，表示不确切的概念如：thousands of visitors 成千上万的游客,1.People in our town planted,_,trees on Tree Planting Day.,Good job!Everyone can do something to make our town greener.,A.hundred B.hundred of C.hundreds of,2.In our city museum,there are many old things from two,_,years ago on show.,A.thousands B.thousand C.thousands of,3.,_,of people from all over the world visit the Palace Museum every year.,A.Two million B.Millions,C.Two millions,C,B,B,1.(2024东营改编)I am the,_,child in my family.I have an elder brother and a younger sister.,A.first B.second C.third,2.(2024甘肃改编)June is the,_,month of a year.,A.fifth B.sixth C.seventh,3.(2024凉山州)Look at the triangle on the right,if AC3,BC4,how long is AB?,Its,_,A.five,B.seven,C.twelve,B,B,A,4.An,_,boy,Li Wen,works hard and gets good grades in his final exam.,A.eighteenyearolds B.eighteenyearold,C.eighteen years old,5.About,_,of my classmates help their parents do housework on weekends.,A.two fifths B.second five,C.second fifths,6.It will be Moms,_,birthday next Wednesday.What should we do?,What about buying her flowers to show our love?,A.forty;forty B.forty;fortieth,C.fortieth;forty,B,A,C,7.There are 24 solar terms in a year.Grain Rain often starts in April,the,_,month of,the year.,A.third B.fourth C.fifth,8.There are,_,people in the picture,and the,_,one from the left is me.,A.eight;third B.eight;three,C.eighth;third,9.The Dragon Boat Festival is on the,_,day of the fifth lunar month.,A.fourth B.fifth C.fifteenth,B,A,B,10.Fathers Day is on the,_,Sunday in June.,A.first B.second C.third,11.There are,_,apples in the basket.Two are big and three are small.,A.five B.seven C.three,12.Franks uncle will welcome his,_,birthday soon.Its the age of“erli”in Chinese.,A.thirtieth B.fortieth C.fiftieth,13.2025 is the Year of the Snake.It comes every,_,years.,A.ten B.twelve C.twenty,C,A,A,B,。