【弯道超车】Unit 2 Amazing numbers 核心语法之数词(分数和小数的表示)-2025年沪教版(2024)新八年级英语上册精讲精练 (含答案解析)

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【弯道超车】Unit 2 Amazing numbers 核心语法之数词(分数和小数的表示)-2025年沪教版(2024)新八年级英语上册精讲精练 (含答案解析)

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/ 让学习更有效 新课备课备考 | 英语学科
/ 让学习更有效 新课备课备考 | 英语学科
2025年沪教版(2024)新八年级英语上册精讲精练
Unit 2 Amazing numbers
核心语法:数词(分数和小数的表示)
一、分数的表示方法
基本结构
分子(基数词) + 分母(序数词)
分子 ≥ 2 时,分母用复数形式(加-s):
1/3 → one-third
2/5 → two-fifths
3/4 → three-quarters(特殊形式)
常见分数示例
分数 英文表达 备注
1/2 one half 不用 "one-second"
1/4 one quarter 或 one-fourth
3/4 three quarters 或 three-fourths
1 1/2 one and a half 带整数用"and"连接
特殊规则
分母为2/4时,常用half/quarter代替序数词:
1/2 → a half(非one-second)
1/4 → a quarter(非one-fourth)
分子为1时,分母用单数序数词:
1/6 → one-sixth(非one-sixths)
二、小数的表示方法
1、基本规则
小数点读作"point",小数点后数字逐位读(不用分数形式):
0.5 → zero point five
3.14 → three point one four
12.08 → twelve point zero eight
2、注意事项
整数部分为0时,可读作"zero"或"nought"(英式):
0.75 → zero point seven five
小数后末尾的"0"可省略不读:
2.50 → two point five
三、分数与小数的实际应用
1、数学表达
1/2 + 0.5 = 1 → One half plus zero point five equals one.
3/4 ≈ 0.75 → Three quarters is approximately zero point seven five.
2、生活中的用法
时间:7:30 → seven thirty 或 half past seven
长度:1.5米 → one point five meters 或 one and a half meters
概率:75% → seventy-five percent(= 3/4)
四、易错点提醒
1、分数单复数混淆
错误:two-third(正确:two-thirds)
错误:three-fifth(正确:three-fifths)
2、小数与分数混用
错误:one point two-thirds(正确:1.666... → one point six recurring)
3、"a"与"one"的区别
1/2 → a half(更口语化)
1/2 → one half(更强调精确性)
1.Read the information below. Which one is RIGHT according to the chart
Nancy John Daniel
Subjects 6 8 12
Clubs 3 2 4
Free time each day 4 hours 3 hours 1 hour
A.Nancy studies the most subjects of the three. B.John is in the most clubs.
C.Daniel has more free time than Nancy. D.John has less free time than Nancy.
2.In our school ________ of the students ________ boys.
A.three fifths; are B.third fifth; are C.three fifth; is
3.It’s said that ________ of the water around the world ________ polluted.
A.two thirds; has B.two thirds; is C.two third; are D.two thirds; have
4.It’s said that ________ of the water around the world ________ polluted.
A.two third; is B.two thirds; is C.two thirds; are
5.—________ of the students in our class have passed the exam.
—Oh, that means 20% of them should work harder.
A.One fifth B.Four five C.Four fifths D.One five
6.________ of the students in Class 6 have lunch at school.
A.Two fifth B.One thirds C.Three fifth D.Three quarters
7.It's said that ________ of the water around the world ________ polluted.
A.two third; has B.two thirds; have C.two thirds; is
8.—What do you think of the environment here
—Wonderful! __________ of the land __________ covered with trees.
A.Two fifths; is B.Two fifth; is C.Two fifths; are D.Two fifth; are
9.According to a survey, four out of five women do housework at home, but only ________ of men would do it.
A.four fifth B.four fifths
C.two fifth D.two fifths
10.The number of the cars in this village is about seven ________, and ________ of them are old cars.
A.hundred; two thirds B.hundred; two third C.hundreds; two thirds D.hundreds; two third
11.________ of the students in our class can work out this problem.
A.Third fives B.Three five C.Three fifths D.Third fifth
12.In our class ________ of the students are girls.
A.three fifths B.three fifth C.third three D.third fifths
13.______ of the land in this area ______ covered with forests.
A.One third; is B.One thirds; is C.One third; are D.One thirds; are
14.In our class ________ of the students ________ boys.
A.three fifths; are B.three fifth; are C.three fifths; is D.three fifth; is
15.About ________ of the students in my school ________ to school by bike.
A.two fifth; go B.two fifths; go C.two fifth; goes D.two fifths; goes
16.________ of his works were written in his ________.
A.One-thirds; fifties B.One-third; fifty
C.Three quarters; fifties D.Three quarters, fiftieth
17.________ of the land in the city is covered with trees and grass..
A.Two five B.Two fifth C.Second five D.Two fifths
18.There are fifty students in our class, ________ of us ________ table tennis.
A.two third; likes
B.two three; like
C.two thirds; like
19.__________ of students are from China.
A.Two third B.Two three C.Two thirds D.Second three
20.—How are you getting along with your work
—We have finished ________ of it.
A.two five B.two fifths C.two fifth D.second fifths
21.This is a big class, and ________ of the students are girls.
A.two third B.second three C.two three D.three quarters
22.About __________ of the earth is covered with water.
A.three-quarter B.three quarters C.three-fourth D.third fourths
23.Oceans cover about ________ of the earth’s surface.
A.three fourth B.three quarter C.three quarters D.third four
24.China has ________ population in the world and about ________of the people in the world live in China.
A.lager, one fifth B.the largest, one fifth
C.largest, one fifths D.large, one fifths
25.About ________ of the people lived a difficult life in the ________.
A.two third; 1960 B.two thirds; 1960s C.two third; 1960s
26.Over ________ of students in this school took part in the survey.
A.one-thirds B.two-thirds C.three quarter D.all
27.There are ________ teachers in our school, and ________ of them are women teachers.
A.two hundreds; three fourth B.two hundred; three fourths
C.two hundred; three forths D.two hundred of; three fourths
28.About ________ of people don’t like watching the movie.
A.two five B.two fifths C.second five D.second fifths
29.________ of the city is covered with trees.
A.Three quarter B.Three fourth
C.Three quarters D.Three four
30.Nowadays, ________ of the old people in the area ________ used to dancing at the square after supper.
A.two thirds; is B.two third; is C.two thirds; are D.second thirds; are
31.Oceans cover about ________ of the earth’s surface, so we call the earth the “Blue Planet”.
A.one-third B.two-thirds C.one-fourth D.two-fifths
32.—Can you read the number 36.36 correctly
—Yes, I can read it as ________.
A.thirty-six point three six B.three six point three six
C.thirty-six point thirty-six D.three six point thirty-six
33.17.17 can be read ______.
A.one seven point one seven B.seventeen point seventeen
C.seventeen point one seven D.one seven point seventeen
34.—Which is the smallest number of the four
—______.
A.Two thirds B.A half C.A quarter D.Three fourths
35.From the study, we know that about ________ of the Earth is covered by forests.
A.three-fifth B.three-fifths C.third-fifth D.thirds-fifths
36.In 1850, about ________ of the land was covered by forest in the USA.
A.third B.the third C.a third D.a thirds
37.Here are more than one hundred teachers in our school. ________ of them are ________.
A.Two fifth; man teachers B.Second fifths; men teacher
C.Two fifths; men teachers D.Second fifths; man teacher
38.About ________ of the students in Grade Nine this year were born in the ________.
A.four fifths; 1990s B.four fifth; 1996
C.fourth five; 1997 D.four fifth; 1990s
39.About ________ of people enjoy the TV play. And 70 percent of the music in it ________ very original (原创的).
A.three fifths; is B.three fifths; are C.three fifth; is D.three fifth; are
40.According to the survey last week, about ________ of students took part in outdoor activities to release their study pressure.
A.three fourth B.three fourths C.third fourths D.third four
41.—________ of the students in our class ________ passed the exam.
—Oh, that means 20% of them should work harder.
A.One fifth; have B.Four five; has C.Four fifths; have
42.According to a survey, four out of five women do housework at home, but only ________ of men will do it.
A.four-fifth B.four-fifths C.two-fifth D.two-fifths
43.China has over ________ of the world’s high-speed railways.
A.second third B.two thirds C.two third
44.—What do you think of the environment here
—Wonderful! ________ of the land ________ covered with trees and grass.
A.Two fifths, are B.Two fifth, is C.Two fifths, is D.Second five, are
45._________ of the land in that district is covered with trees and grass.
A.Two-fifth B.Two-fifths C.Second-fifths D.Two-fives
46.________ of the students in our class are from Nanjing.
A.Three quarters B.Three fourth C.Third fourths D.Three fours
47.The number of the fans going to this concert is about three ________. And ________ of them are girls.
A.thousand; two third B.thousand; two thirds C.thousands; two thirds
48.________ of the students in our class are familiar (熟悉的) with Zhenjiang.
A.Two-fifth B.Two-fifths C.Five-seconds D.Second-fifth
49.About ______ of the teachers in our school are women.
A.three fourth B.three fourths C.third fourths D.third fourth
50.Because of the special situation last year, about _________ of the students in our school _______ having classes on the Internet at home.
A.two thirds; are B.two third; is
C.two thirds; was D.two thirds; were
51.—The ocean covers ________ of the earth’s surface.
—That’s why people call our earth the “Blue Planet”.
A.a half B.a third C.two thirds D.a quarter
52.There are fifty students in this class, and ________ of them are boys, so the number of the boys is 30.
A.three fifth B.three fifths C.three five D.third fifths
53.It says that ________ of the water around the world ________ polluted.
A.Two thirds; have B.two thirds; is C.two third; are
54.The environment here is better now because ________ of the land ________ covered with plants.
A.three fourth; is B.three fourths; is C.three fourths; are D.three fourth; are
55.—About ________ of the workers in the factory were born in the ________.
—We all really admire them because all of them ________ the factory for more than 20 years.
A.two-thirds; 1970s; have been in B.two-thirds; 1970; has joined
C.two-third; 1970; has been at D.two-third; 1970s; have been a member of
56.About ________ of the students in our class like playing basketball.
A.two fifth B.two fifths C.second fifths D.seconds fifth
57.________ of the workers in the factory are men.
A.Three fifths B.Three fifth C.Third fifth D.Third fifths
58.With the help of AI, ________ of the time will be saved when we deal with such problems.
A.two third B.two three C.second three D.two thirds
59.Nearly ________ of the earth is covered by sea, but 95 percent of it ________ salty water.
A.three fourth; is B.three fourths; is C.three fourth; are D.three fourths; are
60.In our class _______ of the students ______ girls.
A.three fifths; are B.three fifth; are C.three fifth; is
/ 让学习更有效 新课备课备考 | 英语学科
/ 让学习更有效 新课备课备考 | 英语学科
21世纪教育网(www.21cnjy.com)
21世纪教育网(www.21cnjy.com)
参考答案及试题解析
1.D
【解析】句意:阅读下面的信息。根据图表,哪一个是正确的?
考查数字运算。根据表格中的信息“Free time each day”可知,三个人中 Nancy的空闲时间最多,其次是John,最后是Daniel,所以John的空闲时间比Nancy少。故选D。
2.A
【解析】句意:在我们学校五分之三的学生是男生。
考查分数表达和主谓一致。分数表达法为“分子基数词,分母序数词,分子大于一时,分母要加s”,所以“五分之三”的正确表达为“three fifths”;“分数+of+名词”作主语时,谓语动词的形式要和该名词保持一致,此处名词students是复数,be动词要用are,故选A。
3.B
【解析】句意:据说世界上三分之二的水被污染了。
考查分数表达及被动语态。分数表达中分子用基数词,分母用序数词,当分子大于一时,分数要变为复数。表示“三分之二”要用two thirds,排除C;主语water与动词之间是被动关系,应该用被动语态be done,表示“被污染”用be polluted,此处是一般现在时的被动语态,可排除A和D,故选B。
4.B
【解析】句意:据说世界上三分之二的水被污染了。
考查分数的表达和主谓一致。分数的表达:分子用基数词,分母用序数词,分子大于一,分母加s,因此第一空two thirds符合句意;结合“the water”是不可数名词,谓语动词用is。故选B。
5.C
【解析】句意:——我们班五分之四的学生通过了考试。——哦,那意味着他们中的20%应该更加努力。
考查分数表达。One fifth五分之一;Four five四五;Four fifths五分之四;One five一五。根据“20% of them should work harder”可知,有20%的学生没通过考试,即五分之一的学生没通过考试,那么通过考试的人数占五分之四。Four fifths表示五分之四。故选C。
6.D
【解析】句意:六班四分之三的学生在学校吃午饭。
考查分数表达。 分子用基数词,分母用序数词,当分子不为一,分母变复数形式。故选D。
7.C
【解析】句意;据说世界三分之二的水都被污染。
考查分词的表达和主谓一致。基数词作分子,序数词作分母,除了分子是“1”以外,其他情况下序数词都要用复数形式。表达“三分之二” 用“two thirds”。“分数 of+名词”做主语时根据名词来判断谓语动词的单复数,“water”是不可数名词,表示“被污染”用“is polluted”。故选C。
8.A
【解析】句意:——你认为这里的环境怎么样?——棒极了!五分之二的陆地被树木和草所覆盖。
考查分数表达法和主谓一致。英语中,分数表达用基数词作分子,用序数词作分母,分子大于1,分母用复数形式,作主语时谓语动词的数由名词来定;结合选项,two fifths表达正确,意思是“五分之二”,可排除BD两项;后空land意为“陆地,土地”,为不可数名词,根据主谓一致的原则,需用is,故选A。
9.D
【解析】句意:根据一项调查,五分之四的女性在家做家务,但只有五分之二的男性愿意这样做。
考查分数表达。根据空前的but only可知此处表示做家务的男人数量比女性少,分数应该比五分之四小,排除AB;结合选项可知,“五分之二”符合题意。在英语中表达分数时,分子用基数词,分母用序数词。如果分子大于1,分母要用复数形式。故选D。
10.A
【解析】句意:小镇车的数量大约七百辆,三分之二是旧车。
考查数词用法。hundred前面有具体数字时,用单数;分数的表示,分子是基数词,分母是序数词,分子大于1时,分母用复数。故选A。
11.C
【解析】句意:我们班五分之三的学生能解决这个问题。
考查数词。表示分数时,分子用基数词,分母用序数词,当分子大于一时,分母用复数形式,three fifths表示“五分之三”,故选C。
12.A
【解析】句意:我们班五分之三的学生是女生。
考查分数表达。英语表达分数时,分子为基数词,分母为序数词,分子大于1时,分母用复数,所以五分之三表达为three fifths,故选A。
13.A
【解析】句意:这个地区三分之一的土地被森林覆盖。
考查分数表达及主谓一致。分数的表达方式为“分子用基数词,分母用序数词,若分子超过了1,分母用序数词的复数”,所以“三分之一”为one third;分数作主语时,谓语动词和of后的名词保持一致,land为不可数名词,谓语动词用单数形式,故选A。
14.A
【解析】句意:在我们班五分之三的学生是男生。
考查数词和主谓一致。three fifths五分之三,are是,主语是you或复数形式;is是,主语是第三人称单数形式;分子大于一时,分母加s,因此排除BD两项;主语students是复数形式,谓语用复数形式,故选A。
15.B
【解析】句意:我们学校大约五分之二的学生骑自行车上学。
考查分数表达及主谓一致。分数分子用基数词,分母用序数词,分子大于1时,分母用复数,“五分之二”用two fifths表达;分数修饰students作主语,students是复数,其后用动词原形。故选B。
16.C
【解析】句意:他的作品有四分之三是在五十几岁时写的。
考查数词。分数的表达:当分子大于一时,分母加s,排除B选项。分析和分母之间的表达不加连字符,排除A选项。fifties五十几;fiftieth第五十;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。in one’s fifties在某人五十几岁时,故选C。
17.D
【解析】句意:这个城市五分之二的土地被树木和草覆盖着。
考查分数表达方式。分数表达方法: 基数词+ 序数词,基数词作分子,序数词做分母, 如果分子(基数词)是大于1,分母(序数词)要变成复数,表示“五分之二”用two fifths。故选D。
18.C
【解析】句意:我们班有五十名学生,三分之二的人喜欢乒乓球。
考查分数的表达及主谓一致。分数的表达为基数词作分子,序数词作分母。当分子大于1时,分母上要加-s,因此第一个空填two thirds;而谓语动词的单复数取决于分数之后的名词,由“us”可知,不能用likes。故选C。
19.C
【解析】句意:三分之二的学生都来自中国。
考查分数。根据“of students”可知,此处应用分数,分子用基数词,分母用序数词,分子大于一,分母用复数,Two thirds即“三分之二”,符合表达,故选C。
20.B
【解析】句意:——你的工作进展如何?——我们已经完成了五分之二。
考查分数表达。英语表达分数时,分子为基数词,分母为序数词,分子大于1,分母加-s,所以五分之二表达为two fifths,故选B。
21.D
【解析】句意:这是一个大班,四分之三的学生是女生。
考查分数的表达,在英语分数中,分子有基数词,分母用序数词,当分子大于1时,分母要+s。排除选项ABC。three quarters表示“四分之三”符合语境,故选D。
22.B
【解析】句意:大约四分之三的地球被水覆盖。
考查分数的表达。分数的表达为:分子为基数词,分母为序数词,当分子大于1时,分母用复数形式,所以四分之三的表达为three quarters或three fourths,故选B。
23.C
【解析】句意:海洋占据了地球表面的四分之三。
考查分数表达。英语中,分数表达通常为:分子用基数词,分母用序数词,当分子大于1时,分母的序数词+s。“quarter”本身就有“四分之一”的意思,所以“四分之三”也可说“three quarters”。故选C。
24.B
【解析】句意:中国是世界上人口最多的国家,世界上大约五分之一的人生活在中国。
考查形容词最高级和分数的表达。lager形容词large的比较级;one fifth五分之一;the largest形容词large的最高级,最大的;largest形容词large的最高级,前面有物主代词或名词所有格等情况时使用;one fifths表述错误;large大的,形容词原级。根据第一空前后has和in the world可知,中国在世界上人口最多,所以这里用最高级the largest。第二空是分数的表达:分子用基数词,分母用序数词(如果分子大于一,分母序数词用复数),所以“五分之一”是one fifth,排除选项C和D。故选B。
25.B
【解析】句意:20世纪60年代,大约三分之二的人过着艰难的生活。
考查分数表达和世纪表达。分数表达法:分子用基数词,分母用序数词,分子大于一,分母加s;1960s表示“20世纪60年代”,也可以写作1960’s。故选B。
26.B
【解析】句意:这所学校超过三分之二的学生参加了调查。
考查分数表达。英语中一般用基数词表示分数的分子,用序数词表示分数的分母,当分子是一时,分数的分母用单数形式;当分数的分子大于一时,分数的分母要用复数形式,可排除AC选项;根据空前的“Over”可知,D项all“所有”不符合逻辑。故选B。
27.B
【解析】句意:——我们学校有200名教师,其中四分之三是女教师。
考查数词和分数的表达。根据“two hundred”可知,表示具体数量时,hundred不加s,排除A;根据“three fourths”可知,分数表达中,分子大于1时,分母用复数形式,排除C;选项D中的“two hundred of”表达错误,不符合语法规则。故选B。
28.B
【解析】句意:大约五分之二的人不喜欢看电影。
考查英语中分数的表达。英语中的分数由基数词和序数词一起表示,基数词作分子在前,序数词作分母在后,分子大于1,分母要用复数形式。故“五分之二”的正确表达为two fifths。故选B。
29.C
【解析】句意:城市的四分之三都被树覆盖了。
考查数词分数表达法。英语中表达分数时,分子用基数词,分母用序数词。分子大于一时,分母要加s。四分之三可表达为:three fourths,three quarters。故选C。
30.C
【解析】句意:现在,这里三分之二的老人习惯于晚饭后在广场上跳舞。
考查分数的表达。根据英语表达习惯,分数的表示方式为“基数词+序数词”,其中基数词作分子,序数词作分母,当分子数大于1时,作分母的序数词要用复数形式,B、D选项可排除。当句子主语是分数或百分数时,谓语动词的单复数由of后面的名词决定,空格后the old people为复数概念,故be动词应用are。故选C。
31.B
【解析】句意:海洋覆盖了地球表面大约三分之二,所以我们称地球为“蓝色星球”。
考查分数的表达。根据“Oceans cover about ... of the earth’s surface”和常识可知,海洋约占地球表面的71%,接近三分之二。故选B。
32.A
【解析】句意:—— 你能正确读出数字36.36吗?—— 是的,我可以把它读成 thirty-six point three six。
考查小数的英语读法。小数的读法是:整数部分按整数读法读,“.”读作“point”,小数部分依次读出每个数字。36读作“thirty-six”,“.36”读作“point three six”,所以36.36读作“thirty-six point three six”,故选A。
33.C
【解析】句意:17.17能被读成seventeen point one seven。小数点左边的整数部分按整数读法或按个位基数词依次读出。小数点右边的小数部分按个位基数词依次读出。在小数点后遇到零时,可读做zero,也可以读做字母O的音。如seventeen point one seven读作17.17,根据题意,故选C。
34.C
【解析】句意:——四个中最小的数是多少?——四分之一。
考查分数表示法。Two thirds三分之二;A half 二分之一;A quarter四分之一;Three fourths四分之三。英语中表示分数时,分母用序数词,分子用基数词,当分子大于1时,表示分母的序数词后要加s,所给选项中最小的是四分之一。故选C。
35.B
【解析】句意:从这项研究中,我们了解到地球约五分之三的面积被森林覆盖。
考查分数表达法。分数表达中分子应用基数词,分母用序数词,当分子大于1的时候,分母用复数。“three-fifths”准确表示“五分之三”,符合语法要求。故选B。
36.C
【解析】句意:1850年,美国大约有三分之一的土地被森林覆盖。
考查分数表达法。third第三;the third第三个;a third三分之一;a thirds错误表达。根据“about ... of the land”及分数表达规则,此处应使用“a third”表示“三分之一”。故选C。
37.C
【解析】句意:我们学校有一百多名老师。他们中有五分之二是男教师。
考查分数表达法和复合名词复数变化规则。英语中的分数由基数词作分子,序数词作分母构成。除了分子是“1”以外,其他情况下序数词都要用复数形式;系动词are后接复数名词,man为单数名词,复数形式为men,作定语修饰名词时,man的形式与后面名词的单复数形式保持一致。故选C。
38.A
【解析】句意:今年九年级大约五分之四的学生出生于20世纪90年代。
考查分数和年代的表达。分数是由基数词和序数词一起来表示的。基数词作分子,序数词作分母,除了分子是“1”以外,其他情况下序数词都要用复数形式。表示在某个世纪的几十年代,用“in the +逢十的基数词的复数”。基数词的复数若用阿拉伯数字表示,可直接加s,也可加’s。分析选项可知,只有选项A符合。故选A。
39.A
【解析】句意:大约五分之三的人喜欢这部电视剧。其中70%的音乐都是原创的。
考查数词和主谓一致。three fifths五分之三;分子大于一时,用复数形式;故排除CD两项。is是,是第三人称单数形式;are是,是复数形式;分数或百分数修饰名词,作主语,谓语根据所修饰的名词判断,此处music是不可数名词,因此谓语用第三人称单数。故选A。
40.B
【解析】句意:根据上周的调查,大约四分之三的学生参加户外活动来释放学习压力。
考查分数的表达。分数由分子和分母构成,分子用基数词,分母用序数词;当分子大于1时,分母需加“s”;根据选项可知,此处表达四分之三应用three fourths表示。故选B。
41.C
【解析】句意:——我们班五分之四的学生通过了考试。 ——哦,那意味着 20% 的学生需要更努力。
考查数词和主谓一致。根据“that means 20% of them should work harder”可知,20%的学生需努力,据此可以推断,80%的学生已经通过了考试,对应的分数为four fifths“五分之四”;主语“four fifths of the students”为复数概念,谓语动词应用原形“have”。故选C。
42.D
【解析】句意:根据一项调查,五分之四的女性在家做家务,但只有五分之二的男性愿意这样做。
考查分数的表达。表达分数时,分子用基数词,分母用序数词,当分子大于1时,分母要用复数,因此排除A、C两项;根据“four out of five women do housework at home, but only …of men will do it.”可知,男性做家务的数量少于女性,女性为五分之四,那么男性应少于五分之四,排除选项B。故选D。
43.B
【解析】句意:中国拥有世界上三分之二的高速铁路。
考查分数的表达。分数的表达为:分子用基数词,分母用序数词,分子大于一,分母加s,因此“三分之二”应说two thirds。故选B。
44.C
【解析】句意:——你认为这儿的环境怎么样?——好极了!五分之二的土地被树和草覆盖着。
考查分数的表达及用法。英语中分数表达方式为:分子用基数词,分母用序数词,当分子大于1的时候,分母要加s,五分之二应表达为two fifths;“分数+of+名词”作主语时,谓语动词应与名词的数保持一致,结合land为不可数名词,所以be动词用其三单形式is。故选C。
45.B
【解析】句意: 该地区五分之二的土地被树木和草地覆盖。
考查分数表达。分数表达规则:分子基数词 (two),分母序数词 (fifths),分子>1时分母加“s”。故选B。
46.A
【解析】句意:我们班四分之三的学生来自南京。
考查分数表达法。 英语中分数的表达规则为:分子用基数词,分母用序数词,若分子大于1,分母需用复数形式。选项B、C、D都不正确,three quarters相当于three fourths,表示“四分之三”。故选A。
47.B
【解析】句意:去听这场音乐会的歌迷人数大约有三千人,其中三分之二是女孩。
考查数词。根据“about three...”可知,空前有数词three,空处应是thousand的单数形式;分数的分子为基数词,分母为序数词,当分子大于一时,分母用复数形式,第二空应是two thirds。故选B。
48.B
【解析】句意:我们班五分之二的学生熟悉镇江。
考查序数词。根据“...of the students in our class are familiar with Zhenjiang”可知,分子用基数词,分母用序数词;当分子大于一时,分母用复数形式。因此,五分之二的正确表达应为“two-fifths”。故选B。
49.B
【解析】句意:我们学校大约四分之三的教师是女性。
考查分数的表达。分数的表达:分子用基数词,分母用序数词。当分子大于 1 时,分母需变为复数形式(即加 -s),所以四分之三为three fourths。故选B。
50.D
【解析】句意:由于去年的特殊情况,我们学校约三分之二的学生在家通过互联网上课。
考查分数的表达以及主谓一致和时态。空一处表示分数,分子用基数词,分母用序数词,当分子大于1时,分母需用复数,因此此处三分之二应表示为two thirds;“分数+of+名词”作主语时,谓语动词常与of后的名词保持数的一致,of后the students是可数名词复数,则谓语动词用复数形式,且根据“last year”可知,时态用一般过去时,因此be用were。故选D。
51.C
【解析】句意:——海洋覆盖了地球表面的三分之二。——这就是为什么人们称我们的地球为“蓝色星球。
考查分数表达和常识。a half二分之一;a third三分之一;two thirds三分之二;a quarter四分之一。根据“Blue Planet”可知,海洋占比较大,再结合常识可知,海洋大约覆盖了地球表面的三分之二。故选C。
52.B
【解析】句意:这个班有50名学生,其中五分之三是男生,所以男生人数是30人。
考查分数表达法。three fifth表述错误;three fifths五分之三;three five表述错误;third fifths表述错误。分数表达由分子和分母组成,分子用基数词,分母用序数词;当分子大于1时,分母要用复数形式;五分之三,分子是3,用基数词three;分母是5,用序数词fifth,由于分子3大于1,所以分母fifth要变为复数形式fifths,即three fifths。故选B。
53.B
【解析】句意;据说世界三分之二的水都被污染。
考查分数表达和主谓一致。基数词作分子,序数词作分母,分子大于“1”时,其他情况下序数词都要用复数形式。表达“三分之二”用“two thirds”;“分数 of+名词”作主语时根据名词来判断谓语动词的单复数,“water”是不可数名词,be动词用is。故选B。
54.B
【解析】句意:这里的环境现在更好了,因为四分之三的土地都被植物覆盖了。
考查分数表达和主谓一致。分数的表达方式为“基数词+序数词”,基数词是分子,序数词是分母,分子大于1时,分母用复数,故 “四分之三” 表达为three fourths;“分数 + of + 名词” 作主语时,谓语动词与名词一致,land为不可数名词,谓语用单数is。故选B。
55.A
【解析】句意:——这家工厂大约三分之二的工人是20世纪70年代出生的。——我们都很钦佩他们,因为他们都在工厂里干了20多年。
考查分数、年代的表达以及现在完成时。根据“About…of the workers in the factory”可知,此处表示这家工厂的三分之二的工人,英语中分数的表达规则为:分子用基数词,分母用序数词,如果分子大于1,分母需变为复数形式,故第一空应填two-thirds;根据“in the…”可知,第二空为年代,结构为“in the+年份复数”,故第二空应填1970s;根据“for more than 20 years”可知,此处应用现在完成时,in the factory“在工厂里”,故第三空应填have been in。故选A。
56.B
【解析】句意:我们班大约五分之二的学生喜欢打篮球。
考查分数表达法。英语中分数的表达规则为:分子用基数词,分母用序数词;当分子大于1时,分母需加-s。此处“五分之二”的正确表达应为“two fifths”。故选B。
57.A
【解析】句意:这家工厂里五分之三的工人是男性。
考查分数的表达。分数的表达方式为“基数词+序数词”,分子用基数词,分母用序数词,分子大于1时,分母用复数,故“五分之三”为three fifths,故选A。
58.D
【解析】句意:在人工智能的帮助下,我们处理此类问题时将节省三分之二的时间。
考查分数表达。分数表达规则:分子用基数词,分母用序数词;当分子>1时,分母要加s,所以三分之二表示为“two thirds”。故选D。
59.B
【解析】句意:地球将近四分之三被海水覆盖,但是95%的水是咸水。
考查分数表达法以及主谓一致。分子用基数词,分母用序数词。分子大于一,分母用复数。“四分之三”的表达方式为three fourths,排除A和C;“分数/百分数+of+名词”作主语时,谓语动词与名词保持一致,本句话中it代指earth,be动词用is,故选B。
60.A
【解析】句意:我们班五分之三的学生是女生。
考查分数表达和主谓一致。分数表达规则:分子用基数词,分母用序数词,分子大于1时分母加-s,故“五分之三”应为three fifths。根据主语“students”是复数,谓语动词需用复数形式are。故选A。
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