Unit 2 基数词和序数词专练-2025-2026学年沪教版 英语八年级上册

Unit 2 基数词和序数词专练 基础夯实层 一、基础认知：核心概念梳理 （一）基数词与序数词核心定义 填写下表，明确基数词、序数词的核心定义及核心用法： 类别 核心定义 核心用法 典型例句 基数词 表示数目多少的数词 描述数量、年龄、时间等 There are fifty students in our class.（我们班有50名学生。） 序数词 表示顺序先后的数词 描述名次、日期、楼层等 My birthday is on June the ninth.（我的生日在6月9日。） （二）数词核心规则 写出基数词变序数词、大数表达、概数表达的核心规则： ￮ 基数词变序数词：1、2、3特殊记，8去t，9去e，ve要用f替，整十变y为ie，后跟th莫忘记；几十几，只变______（个位/十位）。 ￮ 大数表达（hundred/thousand/million）：有具体数字用______（单数/复数），无具体数字表概数用______+of（单数/复数）。 ￮ 序数词修饰名词：前通常加______，表“又一、再一”时加______（a/an/the）。 ￮ 分数表达：分子用______，分母用______，分子大于1时，分母用复数。 二、基础填空：核心规则直接应用 （一）基数词变序数词 1. September is the ______ (nine) month of a year. 2. My mother's ______ (forty) birthday is coming. We'll have a big party for her. 3. The ______ (twelve) lesson is the most difficult in this unit. 4. The ______ (one) day of a week is Sunday in Western countries. 5. The ______ (twenty) century saw many great inventions. （二）大数/概数表达 1. There are about two ______ (thousand) students in our school. 2. ______ (thousand) of people take part in the marathon every year. 3. Three ______ (hundred) workers in this factory are from the countryside. 4. The library has more than five ______ (thousand) books on science. 能力提升层 一、语境填空：结合场景灵活应用 （一）分数/倍数/日期表达 1. ______ (三分之二) of the students in our class like playing basketball. 2. This room is ______ (两倍) as big as that one. 3. Our school was founded on ______ (1949年10月1日) (用英语表达)。 4. ______ (四分之一) of the land is covered with forests. 5. He spends ______ (一半) of his free time reading books. （二）综合填空 1. I go to the cinema ______ (two) a month. 2. He is in his ______ (sixty), but he still works very hard. 3. The ______ (five) boy from the left is my little brother. 4. There are ______ (eight) planets in the solar system. 5. She got the ______ (one) place in the English speech contest. 6. He came in ______ (three) in the running race and won a bronze medal. 二、语境辨析：单项选择 1. About ______ people watched the opening ceremony of the sports meeting. A. two thousand B. two thousands C. two thousand of D. thousands 2. My grandfather was born in the ______ century. A. nineteen B. nineteenth C. nineteen's D. nineteenths 3. We will have a test on ______ of this month. A. the twenty-one B. the twenty-first C. twenty-one D. twenty-first 4. This is ______ time for me to visit the Great Wall. I'm very excited. A. the first B. first C. a first D. an first 5. There are ______ days in a week, and Tuesday is the ______ day. A. seven; three B. seven; third C. seventh; three D. seventh; third 6. ______ trees were destroyed in the storm last year. A. Thousand of B. Thousands C. Thousands of D. Thousand 易错突破层 一、易错点改错：针对性突破 1. The fifth lesson is the most interesting in the nine lessons.（序数词/基数词混用） 错误：________ 改正：________ 2. There are two thousands students in their school.（大数表达错误） 错误：________ 改正：________ 3. I live on the twelve floor of this building.（序数词缺词/形式错误） 错误：________ 改正：________ 4. Three fifth of the water is polluted in the river.（分数表达错误） 错误：________ 改正：________ 5. He came to Beijing for the first time in 2010s.（年代表达错误） 错误：________ 改正：________ 6. This is a second time I have met him.（序数词冠词使用错误） 错误：________ 改正：________ 二、单元主题语篇填空：综合应用 Numbers are amazing and play an important role in our daily life. The ______ (one) people used tally sticks to count things. Later, they created different symbols for numbers. Now we use numbers to do many things. For example, we use them to make a budget. If you save ______ (two) hundred yuan every month, you will have 2,400 yuan a year. We also use numbers to show dates. Our National Day is on October the ______ (one). What's more, numbers can show quantities. ______ (thousand) of people use numbers to plan their journeys every day. Numbers are also important in games. A king once challenged a wise man to a game. He promised to give the man rice on the chessboard: one grain on the ______ (one) square, two on the ______ (two), four on the ______ (three), and so on. He thought it was easy, but he soon realized he couldn't keep his promise—even all the rice in the country was not enough. We can't live without numbers. Let's learn to use them well! 参考答案&考点解析 基础夯实层 一、基础认知：核心概念梳理 （二）数词核心规则 个位；单数；复数；the；a/an；基数词；序数词 二、基础填空：核心规则直接应用 （一）基数词变序数词 1.ninth 2. fortieth 3. twelfth 4. first 5. twentieth 考点：纯基数词变序数词规则记忆，侧重特殊变形（nine→ninth/forty→fortieth） （二）大数/概数表达 1.thousand 2. Thousands 3. hundred 4. thousand 考点：hundred/thousand/million单复数规则，有具体数字用单数，无具体数字用复数+of 能力提升层 一、语境填空：结合场景灵活应用 （一）分数/倍数/日期表达 1.Two thirds 2. twice 3. October the first, 1949 4. A quarter/One fourth 5. half （二）综合填空 1.twice 2. sixties 3. fifth 4. eight 5. first 6. third 二、语境辨析：单项选择 1. A 解析：有具体数字，thousand用单数，不加of（大数表达核心考点） 2. B 解析：世纪表达用序数词，the nineteenth century（序数词表年代考点） 3. B 解析：日期的序数词表达，the twenty-first（序数词表日期考点） 4. A 解析：序数词表“第一次”，前加定冠词the（序数词冠词用法考点） 5. B 解析：表数量用基数词，表顺序用序数词（基数词vs序数词核心区别） 6. C 解析：无具体数字表概数，thousands of（大数概数表达考点） 易错突破层 一、易错点改错：针对性突破 1. nine→ninth（序数词表“第几”，修饰单数名词lesson，表范围中的具体项用序数词） 2. two thousands→two thousand（有具体数字，大数用单数，高频易错点） 3. twelve→the twelfth（楼层用序数词，且序数词前必须加定冠词the，缺词+变形双重错误） 4. Three fifth→Three fifths（分数分子大于1，分母用复数，分数表达高频易错点） 5. 2010s→the 2010s（年代表达前必须加定冠词the，年代表达易错点） 6. a second→the second（表“第二次”用定冠词the，a second表“又一次”，与语境不符，序数词冠词易混点） 二、单元主题语篇填空：综合应用 first；two；first；Thousands；first；second；third 学科网（北京）股份有限公司 $