内容正文:
数词专项分层练习
Part 1: 年龄表达
考点: 表示年龄的固定结构(in one's + 整十基数词复数表示大约年龄;基数词表示具体年龄;序数词表示生日)。
1.My grandfather is still energetic though he is already in his _______.
A. eighties B. eighty C. eightieth D. eighties'
2.She adopted a _______ rescue dog from the shelter.
A. 2 years old B. 2-year-old C. 2-years-old
3.My cousin is _______ years old, and tomorrow is her _______ birthday.
A. fifteen; fifteenth B. fifteenth; fifteen C. fifteen; fifteen
Part 2: 分数、百分比与比例
考点: 分数的构成(分子基数词,分母序数词,分子>1时分母加s);百分比的计算;分数作主语时的主谓一致。
1.In a survey of 60 students, 30% prefer Chinese literature, 25% prefer science books, and 45% prefer foreign novels. How many students like science books?
A. 15 B. 18 C. 25
2.The new policy benefits about _______ of the population in this area.
A. three fifth B. three fifths C. third fifths
3. Nearly _______ of the earth's surface is covered by water.
A. two third B. two thirds C. second thirds
4. Only _______ of the 50 applicants passed the final interview.
A. three fifth B. three fifths C. threes fifth
5. _______ of the paintings in the museum are from the 19th century.
A. Two fifth B. Two fifths C. Twos fifth
6. About _______ of the water in this river _______ polluted.
A. three fourths; is B. three fourth; are C. third fourths; is
Part 3: 序数词应用
考点: 序数词的基本形式;序数词前定冠词the的使用;表示顺序、楼层、日期、页码等。
1. October is the _______ month of the year.
A. ten B. tenth C. tenths
2. "I prefer living on _______ floor for the view," she said.
A. twelve B. twelfth C. the twelfth
3. December is the _______ month of the year.
A. twelfth B. twelveth C. twelve
4. The library has _______ floors, and the rare books are on the _______ floor.
A. five; fifth B. fifth; five C. five; five
5. Read the text from Page 1 to Page 5. The key point is on the _______ page.
A. sixth B. six C. sixthly
6. She won the championship in _______ season of the competition.
A. four B. fourth C. the fourth
Part 4: 约数表达
考点: 表示不确定数量的短语(thousands of, hundreds of等)。
1. Every autumn, _______ swallows migrate to warmer places.
A. thousand B. thousands C. thousands of
Part 5: 基数词与序数词综合应用
考点: 在同一个句子或语境中区分基数词(表数量)和序数词(表顺序/名次)。
1. They completed the project in _______ days and won the _______ prize.
A. ten; first B. ten; one C. tenth; first
学科网(北京)股份有限公司
$$
【参考答案与解析】
Part 1: 年龄表达
考点解析:
- in one's + 整十基数词复数(表约数年龄,如80多岁)
- 基数词 + years old(表具体年龄)
- 序数词(表第几个生日)
答案解析:
1.A. in his eighties 固定搭配,表示“80多岁”。B项eighty(基数词)需搭配具体年龄(如80 years old);C项eightieth(序数词)用于生日;D项eighties'所有格形式错误。
2.B.复合形容词规则:数字与名词用连字符连接,名词用单数(2-year-old)。A项2 years old只能作表语(如The dog is 2 years old);C项2-years-old名词复数错误。
3.A.第一空用基数词fifteen(表年龄数量);第二空用序数词fifteenth(表“第15个生日”)。B、C项序数词与基数词位置错误。
Part 2: 分数、百分比与比例
考点解析:
- 分数构成:分子(基数词) + 分母(序数词),分子>1时分母加-s(如three fifths)。
- 主谓一致:分数短语作主语时,谓语由of后的名词决定单复数。
答案解析
1.A. 计算题:60 × 25% = 15(like science books)。
2.B. 分数规则:分子three>1 → 分母fifths加-s(three fifths)。A项分母未加s;C项third序数词错误。
3.B 同上:分子two>1 → 分母thirds加-s(two thirds)。A项缺s;C项second序数词错误。
4.B. 同题2:three fifths(分子>1,分母加s)。A、C项形式错误。
5.B. 同题2:Two fifths(分子>1,分母加s)。A项缺s;C项Twos拼写错误。
6.A. 主谓一致:主语three fourths of the water中,water不可数 → 谓语用单数is。B项分母缺s且谓语are错误;C项third序数词错误。
Part 3: 序数词应用
考点解析:
- 序数词前必须加定冠词the(表顺序、楼层、日期等)。
- 注意拼写:twelfth(非twelveth),fifth(非fiveth)。
答案解析 :
1.B. 月份顺序:October是第10个月 → tenth(序数词)。A项ten基数词表数量;C项tenths复数形式错误。
2.C. 楼层表达:on the twelfth floor(序数词前必须加the)。A项twelve基数词;B项twelfth缺the。
3.A. 月份顺序:December是第12个月 → twelfth。B项twelveth拼写错误;C项twelve基数词。
4.A. 第一空基数词five(表楼层数量);第二空序数词fifth(表顺序)+ the → the fifth floor。B、C项序数词与基数词混淆。
5.A. 页码顺序:Page 1-5之后是第6页 → the sixth page(序数词)。B项six基数词;C项sixthly为副词(表“第六点”)。
6.C. 比赛季数:in the fourth season(序数词表顺序,必须加the)。A项four基数词;B项fourth缺the。
Part 4: 约数表达
考点解析:
- 约数短语:thousands of(数千),hundreds of(数百)等,需用复数形式 + of。
答案解析
1.C. 固定搭配:thousands of swallows(数千只燕子)。A项thousand单数形式错误;B项thousands缺of。
Part 5: 基数词与序数词综合应用
考点解析:
- 基数词:表数量(如天数、个数)。
- 序数词:表顺序/名次(如第一名)。
答案解析:
1.A. 第一空基数词ten(表完成项目的天数);第二空序数词first(表“一等奖”)。B项one不表名次;C项tenth顺序错误。
学科网(北京)股份有限公司
$$