专题05 数词
1.（2022·上海中考真题）Lily is reading the _________ story in the book about Chinese history. （six）
2．（2021·上海·中考真题）Lily and Mary have known each other for ________ years. (seventh)
3．（2020·上海·中考真题）Uncle Andy tried_____different jobs，and finally chose to be a lawyer．（tenth）
4．（2019·上海·中考真题）On the______page of the book，there is an encouraging story.（eight）
5. （2018·上海·中考真题）Look! The_______lady from the left in the photo is my favourite teacher. (six)
6．（2017·上海·中考真题）My school is going to have an open day on the ________ of next month.（ten）
7．（2016·上海·中考真题）Could you pass me the ________ dictionary from the right on the shelf
8．（2014·上海·中考真题）The medicine should be taken_______a day after meals, George. (two)
9．（2015·上海·中考真题）Rose received a letter full of love from her parents on her ______ birthday.
A．sixteen B．sixteen’s
C．sixteenth D．sixteenths
10．（2012·上海·中考真题）Last year, I visited a chemical factory in Baise, there are about ________ workers in it.
A．six thousands B．six thousand C．six thousands of D．six thousand of
知识图表 （数词）
1. 序数词的拼写 序数词缩写序数词缩写first second third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12thtwentieth twenty-first thirtieth thirty-fifth fortieth fiftieth sixtieth seventieth eightieth ninetieth hundredth20th 21st 30th 35th 40th 50th 60th 70th 80th 90th 100th
2. 表示计量： 即事物的长度、宽度、深度和高度，应采用基数词。 It is 50 metres / kilometers/miles long (wide, deep, high). 它有50米/千米/英里长（宽、深、高）。
3. 表示编号： 编号的数字如果过小，可用序数词或基数词表示；如果数字较大，通常用基数词表示。 1. The tenth lesson=Lesson Ten 第10课
2. Room 405 第405号房
3. Page 215 第215页
4. No.14 Middle School 第14中学
5. Telephone NO.5855806 电话： 5855806
4. 表示不确切的数字： 基数词后面直接加上复数名词表示精确的数字，而基数词复数形式加上“of” 表示不确切的数字。 1. five hundred students 500名学生
2. two thousand people 2000人
3. five dozen pencils 5打铅笔
4. hundreds of students 几百名学生
5. millions of workers 成千上万的工人
6. scores of chairs 几十张椅子
5. 表示年龄和岁数
1. He is a boy of 10 yeas old.
= He is 10 yeas old.
= He is 10 (years of age).
= He is a ten-year-old boy. 2. At the age of ten, he began to learn English. 3. My father is in his fifties. 我爸爸50多岁。
6. 表示年代： 表示什么世纪，什么年代时，通常在数词后加s或’s，并在年代前加定冠词the , 1. 1980’s/ 1980s（20世纪80年代）， 读作：nineteen eighties. 2. His grandfather died in the 1970’s/1970s。
7. 表示分数： 分子用基数词，分母用序数词。分子是one时，分母不必加s; 分子大于one时，分母要加s. 1. a(=one) third 三分之一 one fifth 五分之一
2. two thirds 三分之二 three fourths 四分之三
3. Two thirds of the trees were cut down ten years ago.
8. 表示百分数： 百分数的表达方式是：基数词+ percent（单数形式）+of+名词。 1. Thirty percent of the students in my class are from cities. 2. About 61 percent of the surface is covered by water.
命题点一：基数词用法
一、单项选择
1．（2022·上海徐汇·二模）The topic “Food Safety” receives ________ Internet hits (点击) from customers every day.
A．thousands B．thousand C．thousand of D．thousands of
2．（2022·上海·模拟预测）It took the ancient Chinese people several ________ years to finish building the Great Wall.
A．hundred B．hundreds C．hundreds of D．three hundred
3．（2022·上海静安·一模）My neighbour Granny Wang had a lovely granddaughter in her ________.
A．fifty B．fifties C．fiftieth D．fiftieths
4．（2020·江苏·扬州中学教育集团树人学校一模）His father joined the Party in ________when he was in________ .
A．1960s; twenties B．the 1960s; his twentieth
C．1960; his twenties D．1960s; the twenties
5．（2023·全国·九年级专题练习）My father joined the army in________when he was in________.
A．1960s; twenties B．the 1960s; his twentieth
C．1960; his twenties D．1960s; the twenties
6．（2023·全国·九年级专题练习）Xi Jinping, our _____________ president, paid a visit to Harbin last month. How encouraging!
A．69 years old B．69 years’ old C．69-year-old
7．（2022·黑龙江·哈尔滨市第一六三中学校一模）Tom who is ________ years old chose the ________ problem. At last, he worked it out and won the game.
A．nineth, forty B．nine, fortith C．nineteen, fortieth
8．（2021·江苏宿迁·九年级期末）Jackie Chan entered the film industry in ________ when he was in ________.
A．the 1970s; twentieth B．the 1970s; his twenties
C．1970; the twenties D．1970s; his twenties
9．（2022·全国·九年级单元测试）Up to now, almost ________ of the students in the class have completed ________ of their work.
A．two-thirds; 60 percents B．two-thirds; 60 percent
C．two third; 60 percents D．two third; 60 percent
10．（2018·上海市民办上宝中学九年级期中）Wechat attracts ____ the people, they spend 80-90 _____ their spare time on it.
A．a large percent of, percent of B．a high percent of, percentage of
C．a high percentage of, percent of D．a large percentage of, percents of
11．（2022·甘肃·金昌市第六中学一模）I think we need ten more minutes to clean the classroom.
A．another B．ten others C．more ten D．another ten
12．（2022·全国·九年级课时练习）—Have you got ready for your trip
—Not yet. We need ________ boxes.
A．more three B．other three C．another three D．three another
二、用所给单词的正确形式填空
13．（2023·上海黄浦·一模）Maria, a lady in her late _________, looks young for her age.（thirty）
14．（2022·上海松江·二模）After ________ days at sea, they returned home. (twelfth)
15．（2022·上海奉贤·二模）Gu Ailing won ________ (twice) gold medals for China at the Beijing Winter Olympic Games.
16．（2022·上海静安·二模）Eileen Gu has won ________ gold medals at 2022 Winter Olympics. (second)
17．（2022·上海长宁·二模）I hope that my grandmother will still be healthy and active in her ________. (ninety)
18．（2022·上海·模拟预测）Although Zhong Nanshan is already in his ________ , he is still very energetic.(eighty)
19．（2022·上海嘉定·一模）At the age of _________ Joe climbed the Great Wall by himself. (fifth)
20．（2022·上海·模拟预测）The lady in her late _________ looks young for her age. (forty)
21．（2022·上海浦东新·一模）It was said that the ________ criminal had been arrested by that time. (nine)
22．（2018·上海·二模）Roger Federer, a tennis player in his_________,won the Australia Open on January 28.(thirty)
23．（2021·上海·模拟预测）Tom’s grandfather showed great interest in Beijing opera in his ________. （fifty）
24．（2021·上海·模拟预测）Simon learned how to fish with cormorants in his ______.（twenty）
25．（2021·上海松江·二模）Tom called his wife _________ a day when he was on business in another city. （one）
命题点二：序数词用法
一、单项选择
1．（2022·上海·模拟预测）—Dad, Could you tell me ________
—Well, it’s large and full of water. It covers about ________ of the earth.
A．how the sea is; one third B．what the sea is like; three quarters
C．how’s the sea; three-fourth D．what the sea is like; three quarter
2．（2022·上海·模拟预测）Nowadays, ________ people like HUAWEI phones better, and about ________ of them are adults.
A．a number of; four fifths B．a number of; four fifth
C．the number of; four fifth D．the number of; four fifths
3．（2020·上海虹口·二模）Grandpa received a mobile phone from Auntie Liu on his ________ birthday.
A．sixty B．sixtieth C．sixties D．sixtieths
4．（2022·江苏·常州市第二十四中学九年级期中）It is reported ________ of the soil around the world was polluted in the ________.
A．two-thirds; 1990 B．two-third; 1990s
C．to-third; 1990 D．two-thirds; 1990s
5．（2022·江苏徐州·七年级期中）—Wilson, do you and Elan live in the same building
—Yes, I live on the ______ floor, ______ floors above Elan.
A．fifth; two B．two; fifth C．five; second D．fifth; second
二、用所给单词的正确形式填空
6．（2023·上海闵行·一模）About one billion people speak English as a native or ________ language. (two)
7．（2023·上海静安·一模）Lily is a web fiction lover and this is the ________ book she has read this year. (ten)
8．（2022·上海杨浦·二模）The young athlete won ________ place in the Women’s Ski Slopestyle. (four)
9．（2019·上海杨浦·三模）The _______ grade is very important for students who want to get into the right school. (nine)
10．（2022·上海嘉定·模拟预测）Susan rent a new office on the __________ floor in that business center. (five)
11．（2022·上海青浦·二模）The Dragon Boat Festival in 2022 is on June the ________. (three)
12．（2022·上海宝山·二模）Emily bought her aunt a nice coat on her ________ birthday. (forty)
13．（2022·上海·模拟预测）After his ________ birthday, Tom will go abroad to further his study. (twenty)
14．（2022·上海·模拟预测）We celebrated the ________ birthday of the Communist Party of China on July 1, 2021. (hundred)
15．（2020·上海松江·二模）Take the lift to the ________ floor, and you will have a better view of the city. (twelve)专题05 数词
1.（2022·上海中考真题）Lily is reading the _________ story in the book about Chinese history. （six）
【答案】sixth
【详解】句意：莉莉正在读关于中国历史的书中的第六个故事。six是基数词，结合“the...story”可知此处应用序数词表示顺序，故填sixth。
2．（2021·上海·中考真题）Lily and Mary have known each other for ________ years. (seventh)
【答案】seven
【详解】句意：莉莉和玛丽互相认识七年了。seventh第七，是序数词，修饰复数名词years，用基数词，故填seven。
3．（2020·上海·中考真题）Uncle Andy tried_____different jobs，and finally chose to be a lawyer．（tenth）
【答案】ten
【详解】句意：安迪叔叔尝试了十种不同的工作，最后选择了当律师。
tenth第十，序数词。这里表示"十种不同的工作"，用基数词ten。故答案为ten。
【点睛】英语中的基数词是用于描述事物数量的多少，根据提示，结合语境，正确写出答案。
4．（2019·上海·中考真题）On the______page of the book，there is an encouraging story.（eight）
【答案】．eighth
【解析】句意：在这本书的第八页，有一个令人鼓舞的故事。
这里表示第几页用序数词，eight的序数词是eighth。根据题意，故填eighth。
5. （2018·上海·中考真题）Look! The_______lady from the left in the photo is my favourite teacher. (six)
【答案】sixth
【解析】句意：看照片中左边的_______女士是我最喜欢的老师。这里表示第六个，填序数词。故填sixth。
6．（2017·上海·中考真题）My school is going to have an open day on the ________ of next month.（ten）
【答案】tenth
【解析】考查序数词。根据句意和句中的定冠词the，空白处要填ten的序数词形式，故填tenth。
7．（2016·上海·中考真题）Could you pass me the ________ dictionary from the right on the shelf
【答案】seventh
【详解】句意：你能把架子上从右边数第七本字典递给我吗？根据题意，表达顺序，the+序数词，表示第7本书，用序数词， seventh是序数词，第七；在句中作定语修饰dictionary， 故填seventh。
8．（2014·上海·中考真题）The medicine should be taken_______a day after meals, George. (two)
【答案】twice
【解析】句意：这种药应该饭后一天吃两次。结合语境可知填副词twice，两次。
9．（2015·上海·中考真题）Rose received a letter full of love from her parents on her ______ birthday.
A．sixteen B．sixteen’s
C．sixteenth D．sixteenths
【答案】C
【详解】句意：罗斯在她的十六岁生日的时候，从他的父母那里收到了一封充满爱的信。one’s +序数词+birthday ，某人多少岁生日。在分数的表达中，只有在分数中分子大于1时，做分母的序数词才变成复数。结合句意，可知该题表示第十六个生日，故选C。
10．（2012·上海·中考真题）Last year, I visited a chemical factory in Baise, there are about ________ workers in it.
A．six thousands B．six thousand C．six thousands of D．six thousand of
【答案】B
【详解】句意：去年，我参观了百色的一家化工厂，那里大约有6000名工人。
考查数词。hundred的用法是：表示确切数字时，一般用“数词+ hundred +可数名词的复数”结构。表示大概数字时，一般用“hundreds of +可数名词的复数”，意为“成百上千的”。四个选项带有数词six，故应用“six thousand”形式。故选B。
知识图表 （数词）
1. 序数词的拼写 序数词缩写序数词缩写first second third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12thtwentieth twenty-first thirtieth thirty-fifth fortieth fiftieth sixtieth seventieth eightieth ninetieth hundredth20th 21st 30th 35th 40th 50th 60th 70th 80th 90th 100th
2. 表示计量： 即事物的长度、宽度、深度和高度，应采用基数词。 It is 50 metres / kilometers/miles long (wide, deep, high). 它有50米/千米/英里长（宽、深、高）。
3. 表示编号： 编号的数字如果过小，可用序数词或基数词表示；如果数字较大，通常用基数词表示。 1. The tenth lesson=Lesson Ten 第10课
2. Room 405 第405号房
3. Page 215 第215页
4. No.14 Middle School 第14中学
5. Telephone NO.5855806 电话： 5855806
4. 表示不确切的数字： 基数词后面直接加上复数名词表示精确的数字，而基数词复数形式加上“of” 表示不确切的数字。 1. five hundred students 500名学生
2. two thousand people 2000人
3. five dozen pencils 5打铅笔
4. hundreds of students 几百名学生
5. millions of workers 成千上万的工人
6. scores of chairs 几十张椅子
5. 表示年龄和岁数
1. He is a boy of 10 yeas old.
= He is 10 yeas old.
= He is 10 (years of age).
= He is a ten-year-old boy. 2. At the age of ten, he began to learn English. 3. My father is in his fifties. 我爸爸50多岁。
6. 表示年代： 表示什么世纪，什么年代时，通常在数词后加s或’s，并在年代前加定冠词the , 1. 1980’s/ 1980s（20世纪80年代）， 读作：nineteen eighties. 2. His grandfather died in the 1970’s/1970s。
7. 表示分数： 分子用基数词，分母用序数词。分子是one时，分母不必加s; 分子大于one时，分母要加s. 1. a(=one) third 三分之一 one fifth 五分之一
2. two thirds 三分之二 three fourths 四分之三
3. Two thirds of the trees were cut down ten years ago.
8. 表示百分数： 百分数的表达方式是：基数词+ percent（单数形式）+of+名词。 1. Thirty percent of the students in my class are from cities. 2. About 61 percent of the surface is covered by water.
命题点一：基数词用法
一、单项选择
1．（2022·上海徐汇·二模）The topic “Food Safety” receives ________ Internet hits (点击) from customers every day.
A．thousands B．thousand C．thousand of D．thousands of
【答案】D
【详解】句意：“食品安全”这个话题每天都会从顾客那里收到成千上万的互联网点击。
考查数词。thousand“千”，表示约数时，与of连用，后面加s，如thousands of“成千上万的，好几千”；表示具体数时，与数词连用，不加s，如two thousand“两千”，故选D。
2．（2022·上海·模拟预测）It took the ancient Chinese people several ________ years to finish building the Great Wall.
A．hundred B．hundreds C．hundreds of D．three hundred
【答案】A
【详解】句意：古代中国人花了几百年才建成长城。
考查hundred用法。hundred前面有具体数字修饰时，不加s不加of；没有具体数字修饰时，要加s加of；本题空前有“several”修饰，hundred后面不用加s，故选A。
3．（2022·上海静安·一模）My neighbour Granny Wang had a lovely granddaughter in her ________.
A．fifty B．fifties C．fiftieth D．fiftieths
【答案】B
【详解】句意：我的邻居王奶奶五十多岁时有一个可爱的孙女。
考查数词用法。fifty“五十”，基数词；fifties，fifty的复数；fiftieth“第五十”，序数词；fiftieths，fiftieth的复数；in one’s+逢十的基数词复数，表示在某人几十岁时。故选B。
4．（2020·江苏·扬州中学教育集团树人学校一模）His father joined the Party in ________when he was in________ .
A．1960s; twenties B．the 1960s; his twentieth
C．1960; his twenties D．1960s; the twenties
【答案】C
【详解】句意：他的父亲在1960年20多岁的时候加入了党。
考查数词。动词“joined the Party”指的是具体的哪一年，用in+表示年份的阿拉伯数字，此处用in 1960。表示某人几十多岁这样的约略年龄，用“in one’s+逢十的基数词的复数”，此处用in his twenties。故选C。
5．（2023·全国·九年级专题练习）My father joined the army in________when he was in________.
A．1960s; twenties B．the 1960s; his twentieth
C．1960; his twenties D．1960s; the twenties
【答案】C
【详解】句意：我父亲在1960年参军，那时他20多岁。
考查时间表达。in+年份表示“在某一年”；in the+数字s表示“在……年代”；in one’s+基数词复数表示“在某人几十多岁时”；第一空根据空前“in”，可知其后不直接跟1960s，排除A、D；再由第二空前in可知要用“in one’s+基数词复数”结构，其他选项均不与in搭配，排除B。故选C。
6．（2023·全国·九年级专题练习）Xi Jinping, our _____________ president, paid a visit to Harbin last month. How encouraging!
A．69 years old B．69 years’ old C．69-year-old
【答案】C
【详解】句意：习近平，我们的六十三岁的总书记，上个月到哈尔滨视察，多么的令人鼓舞！
考查年龄段的表达。63 years old六十三岁，表示年龄； 63 years’ old结构错误；63-year-old六十三岁的，复合形容词，用来修饰名词。根据“our…president”可知此处缺少形容词作定语，故选C。
7．（2022·黑龙江·哈尔滨市第一六三中学校一模）Tom who is ________ years old chose the ________ problem. At last, he worked it out and won the game.
A．nineth, forty B．nine, fortith C．nineteen, fortieth
【答案】C
【详解】句意：十九岁的汤姆选择了第四十道题。最后，他算出了答案，赢得了比赛。
考查数词。第一个空表示“……岁”，用基数词表示年龄，故排除A；第二个空前有“the”，说明是序数词，forty的序数词时fortieth。故选C。
8．（2021·江苏宿迁·九年级期末）Jackie Chan entered the film industry in ________ when he was in ________.
A．the 1970s; twentieth B．the 1970s; his twenties
C．1970; the twenties D．1970s; his twenties
【答案】B
【详解】句意：成龙在20世纪70年代进入电影行业，当时他20多岁。
考查固定用法。“in+ the +逢十的数词复数”， 意为“在多少年代”，“in+年份”意为“在具体哪一年”，首先排除D；“in one’s+数字基数词复数” 意为“在某人多少岁时”，排除A和C选项，“in the 1970s”和“in his twenties”符合语境。故选B。
9．（2022·全国·九年级单元测试）Up to now, almost ________ of the students in the class have completed ________ of their work.
A．two-thirds; 60 percents B．two-thirds; 60 percent
C．two third; 60 percents D．two third; 60 percent
【答案】B
【详解】句意：到目前为止，班上几乎三分之二的学生已经完成了60%的作业。
考查分数和百分数的写法。英语中的分数写法：分子用基数词，分母用序数词，分子大于1时，作分母的序数词用复数。因此排除C/D；百分之几：在英语中用数字+percent表示。故选B。
10．（2018·上海市民办上宝中学九年级期中）Wechat attracts ____ the people, they spend 80-90 _____ their spare time on it.
A．a large percent of, percent of B．a high percent of, percentage of
C．a high percentage of, percent of D．a large percentage of, percents of
【答案】C
【详解】句意：微信吸引了很高比例的人，他们在微信上花费了80-90%的空闲时间。
考查百分数的用法。percent的用法是：数词+ percent+ of+ sth；percentage的用法是：the percentage of+ sth。分析第一处可知，此处表示“很高比例”的含义，应用a high percentage of表示；第二处前有具体数词80-90，所以用percent of修饰。结合选项，故选C。
11．（2022·甘肃·金昌市第六中学一模）I think we need ten more minutes to clean the classroom.
A．another B．ten others C．more ten D．another ten
【答案】D
【详解】句意：我想我们还需要十分钟来打扫教室。
考查数词的表达。基数词+more+名词=another+基数词+名词，所以此空应填another ten，故选D。
12．（2022·全国·九年级课时练习）—Have you got ready for your trip
—Not yet. We need ________ boxes.
A．more three B．other three C．another three D．three another
【答案】C
【详解】句意：——你准备好旅行了吗？——现在还没有。我们还需要三个盒子。
考查“又几个”的表达方法。more、other修饰可数名词复数，与具体数字连用时，置于具体数字之后；another修饰可数名词复数，与具体数字连用时，置于具体数字的前面。故选C。
二、用所给单词的正确形式填空
13．（2023·上海黄浦·一模）Maria, a lady in her late _________, looks young for her age.（thirty）
【答案】thirties
【详解】句意：玛丽亚，一位年近三十的女士，看上去比她的年龄年轻。in one’s+基数词的复数形式，表示在某人几十多岁时，所以此空应填thirty的复数形式thirties，故填thirties。
14．（2022·上海松江·二模）After ________ days at sea, they returned home. (twelfth)
【答案】twelve
【详解】句意：在海上待了十二天后，他们回到了家。根据“days”可知，此空使用基数词，twelve“十二”，后跟可数名词复数。故填twelve。
15．（2022·上海奉贤·二模）Gu Ailing won ________ (twice) gold medals for China at the Beijing Winter Olympic Games.
【答案】two
【详解】句意：谷爱凌在北京冬奥会上为中国赢得了两枚金牌。根据空格后“medals”提示，此处应用基数词，twice的基数词形式为two，意为“两个”，符合句意，故填two。
16．（2022·上海静安·二模）Eileen Gu has won ________ gold medals at 2022 Winter Olympics. (second)
【答案】two
【详解】句意：谷爱凌在2022年冬奥会上获得了两枚金牌。根据“Eileen Gu has won...gold medals at 2022 Winter Olympics.”可知，此处表示数量，用基数词two“二”，故填two。
17．（2022·上海长宁·二模）I hope that my grandmother will still be healthy and active in her ________. (ninety)
【答案】nineties
【详解】句意：我希望我的祖母在90多岁的时候仍然健康、活跃。in one’s +基数词复数形式，表示“在某人几十多岁”，in her nineties 在她90多岁的时候，故填nineties。
18．（2022·上海·模拟预测）Although Zhong Nanshan is already in his ________ , he is still very energetic.(eighty)
【答案】eighties
【详解】句意：虽然钟南山已经八十多岁，但是他仍然非常有活力。表达某人几十多岁这样的约略年龄，用“in one’s+逢十的基数词的复数”来表达。句子表达“他八十多岁”用“in his eighties”。故填eighties。
19．（2022·上海嘉定·一模）At the age of _________ Joe climbed the Great Wall by himself. (fifth)
【答案】five
【详解】句意：乔五岁时独自爬上了长城。“at the age of+基数词”表示“在……岁时”，是固定结构，空处用基数词形式，故填five。
20．（2022·上海·模拟预测）The lady in her late _________ looks young for her age. (forty)
【答案】forties
【详解】句意：这位四十多岁的女士看上去比实际年龄年轻。in one’s +基数词复数表示“在某人几十岁的时候”，此处使用forty的复数形式。故填forties。
21．（2022·上海浦东新·一模）It was said that the ________ criminal had been arrested by that time. (nine)
【答案】ninth
【详解】句意：据说当时第九名罪犯已经被捕。nine“九”，是基数词，根据“It was said that the...criminal had been arrested ”可知此处是指第九个罪犯，ninth“第九”，是序数词，故填ninth。
22．（2018·上海·二模）Roger Federer, a tennis player in his_________,won the Australia Open on January 28.(thirty)
【答案】thirties
【详解】句意：Roger Federer,30多岁的网球运动员，于1月28日获得澳大利亚网球公开赛冠军。in one’s thirties表示在某人30多岁的时候。根据句意，故填thirties。
23．（2021·上海·模拟预测）Tom’s grandfather showed great interest in Beijing opera in his ________. （fifty）
【答案】fifties
【详解】句意：汤姆的祖父五十多岁时对京剧产生了浓厚的兴趣。“in+one’s+整十的复数”表示“在某人几十多岁时”，fifty的复数为fifties。故填fifties。
24．（2021·上海·模拟预测）Simon learned how to fish with cormorants in his ______.（twenty）
【答案】twenties
【详解】句意：西蒙二十多岁时学会了用鸬鹚捕鱼。表示某人几十多岁这样的约略年龄，用“in one’s+逢十的基数词的复数(如tens, twenties, thirties等)”来表达。故填twenties。
25．（2021·上海松江·二模）Tom called his wife _________ a day when he was on business in another city. （one）
【答案】once
【详解】句意：汤姆在另一个城市出差时，每天给他妻子打一次电话。根据句中的“a day”可知，空格上填once表示频率，说的是“一天一次”，在句中作状语，故填once。
命题点二：序数词用法
一、单项选择
1．（2022·上海·模拟预测）—Dad, Could you tell me ________
—Well, it’s large and full of water. It covers about ________ of the earth.
A．how the sea is; one third B．what the sea is like; three quarters
C．how’s the sea; three-fourth D．what the sea is like; three quarter
【答案】B
【详解】句意：——爸爸，你能告诉我大海是什么样子吗？——嗯，它很大而且充满了水。它覆盖了大约地球的四分之三。
考查宾语从句和分数表达法。how the sea is大海怎么样，陈述语序；what the sea is like大海是什么样子，陈述语序；how’s the sea大海怎么样，疑问语序。根据句子结构可知，空一处的句子是宾语从句，故应用陈述语序，故排除C项；根据答语“Well, it’s large and full of water.”可知，应是问“大海是什么样子”，故排除A项；分数表达法：分子用基数词，分母用序数词；分子大于一时，分母加s，故“四分之一”可表达为：one fourth/a quarter/one quarter，故“四分之三”应表达为three quarters，故排除D项。故选B。
2．（2022·上海·模拟预测）Nowadays, ________ people like HUAWEI phones better, and about ________ of them are adults.
A．a number of; four fifths B．a number of; four fifth
C．the number of; four fifth D．the number of; four fifths
【答案】A
【详解】句意：现在，很多人更喜欢华为手机，其中大约五分之四是成年人。
考查形容词短语以及分数表达。a number of许多；the number of……的数量。根据“people like HUAWEI phones better”可知，此处指许多人喜欢华为，故第一空填a number of。分数的表达：分子用基数词，分母用序数词，当分子大于1时，分母用序数词的复数形式，故“五分之四”的表达为：four fifths，故选A。
3．（2020·上海虹口·二模）Grandpa received a mobile phone from Auntie Liu on his ________ birthday.
A．sixty B．sixtieth C．sixties D．sixtieths
【答案】B
【详解】句意：爷爷在六十大寿那天收到了刘阿姨的手机。
考查数词辨析。sixty六十，sixties是其复数形式；sixtieth，无复数形式，故D项错误。“on one’s +序数词+ birthday”表示在某人多少岁生日时。根据句意语法，故选B。
4．（2022·江苏·常州市第二十四中学九年级期中）It is reported ________ of the soil around the world was polluted in the ________.
A．two-thirds; 1990 B．two-third; 1990s
C．to-third; 1990 D．two-thirds; 1990s
【答案】D
【详解】句意：据报道，世界上三分之二的土壤在20世纪90年代受到污染。
考查分数及年代的表达。英语中分数的表达为：分母用序数词，分子用基数词，当分子大于1时，分母要加-s，因此三分之二表达为two-thirds，排除选项BC；表示世纪和年代时，用in the+年份的复数，因此20世纪90年代表示为in the 1990s。故选D。
5．（2022·江苏徐州·七年级期中）—Wilson, do you and Elan live in the same building
—Yes, I live on the ______ floor, ______ floors above Elan.
A．fifth; two B．two; fifth C．five; second D．fifth; second
【答案】A
【详解】句意：——Wilson，你和Elan住在同一栋楼里吗？——是的，我住在五楼，在Elan楼上两层。
考查数词。根据“I live on the…floor”可知居住在几楼要用序数词，第一空应填fifth；由“…floors above Elan”可知比Elan高两层楼应用基数词，第二空应填two。故选A。
二、用所给单词的正确形式填空
6．（2023·上海闵行·一模）About one billion people speak English as a native or ________ language. (two)
【答案】second
【详解】句意：大约有10亿人把英语作为母语或第二语言。此处在句中作定语修饰language，用序数词形式，故填second。
7．（2023·上海静安·一模）Lily is a web fiction lover and this is the ________ book she has read this year. (ten)
【答案】tenth
【详解】句意：莉莉是一个网络小说爱好者而这是她今年读的第十本书。ten“十”，基数词。根据定冠词“the”和单数名词“book”可知，此处应用序数词，表示“第十本书”。故填tenth。
8．（2022·上海杨浦·二模）The young athlete won ________ place in the Women’s Ski Slopestyle. (four)
【答案】fourth
【详解】句意：这个年轻的运动员在女子大跳台中赢得了第四名。根据句意可知，此处考查短语win fourth place“赢得第四名”，place“名次”，通常与序数词搭配，且序数词前冠词通常省略。故填fourth。
9．（2019·上海杨浦·三模）The _______ grade is very important for students who want to get into the right school. (nine)
【答案】ninth
【详解】句意：对于那些想进入合适学校的学生来说，九年级是非常重要的。nine“九”，基数词。根据“grade”和 “students”可知，此处考查序数词ninth“第九”。序数词常与定冠词the连用，the ninth grade“九年级”。故填ninth。
10．（2022·上海嘉定·模拟预测）Susan rent a new office on the __________ floor in that business center. (five)
【答案】fifth
【详解】句意：苏珊在那个商业中心的五楼租了一间新办公室。根据“on the … floor”可知，此处指第五层楼，使用序数词，fifth“第五”，序数词前使用定冠词the修饰，故填fifth。
11．（2022·上海青浦·二模）The Dragon Boat Festival in 2022 is on June the ________. (three)
【答案】third
【详解】句意：2022年的端午节是六月三日。此处表示日期，空前有the修饰，此处用序数词形式，故填third。
12．（2022·上海宝山·二模）Emily bought her aunt a nice coat on her ________ birthday. (forty)
【答案】fortieth
【详解】句意：Emily在她阿姨四十岁的生日上给她买了一件好看的外套。根据“on her ... birthday”可知，此处需要填写序数词，表示“第……个生日”，结合所给单词，应用其对应的序数词fortieth。故填fortieth。
13．（2022·上海·模拟预测）After his ________ birthday, Tom will go abroad to further his study. (twenty)
【答案】twentieth
【详解】句意：汤姆二十岁生日后将出国深造。根据“birthday”可知，此处表示“第二十个”生日，因此这里用序数词；twenty“二十”，基数词，序数词是twentieth。故填twentieth。
14．（2022·上海·模拟预测）We celebrated the ________ birthday of the Communist Party of China on July 1, 2021. (hundred)
【答案】hundredth
【详解】句意：我们在2021年7月1日庆祝了中国共产党的一百岁生日。根据空前的“the”和空后的“birthday”可知，应该填的是hundred“一百”的序数词the hundredth“第一百”，故填hundredth。
15．（2020·上海松江·二模）Take the lift to the ________ floor, and you will have a better view of the city. (twelve)
【答案】twelfth
【详解】句意：乘电梯到12楼，你将能更好地欣赏这个城市。
根据句意和floor可知是“乘电梯到第十二层楼”，所以用序数词twelfth；故填twelfth。
