最新初中英语语法知识—数词的解析含答案
英语数词含答案解析百度文库
英语数词含答案解析百度文库一、初中英语数词1．It's about ________________ kilometers from Nanchong to Chengdu.A. two hundredsB. two hundreds ofC. two hundredD. two hundred of【答案】 C【解析】【分析】句意：从南昌到成都大约有两百公里。
由句意可知，这里说的是“两百公里”two是基数词表示确切的数字，不能用百、千的复数形式，“two hundred”；但当基数词表示不确切数字，百、千后就要用复数形式，如“hundreds of”，故选C。
【点评】考查基数词的用法，注意表示确切的数字时，其后不能用百、千的复数形式。
2．_________ of the teachers are women in our school.A. Two thirdB. Two threesC. Two thirdsD. Two【答案】 C【解析】【分析】句意：在我们学校三分之二的老师是女老师。
表达分数时，分子用基数词，分母用序数词，分子大于1时，分母用复数。
三分二，二是分子，所以用基数词two，三是分母，所以用序数词third，分子二大于一，所以分母third用复数thirds，所以三分之二用two thirds，故选C。
【点评】考查分数表达，注意平时识记其表达规则。
3．We throw rubbish every year.A. ton ofB. tonsC. tons ofD. a ton of【答案】 C【解析】【分析】句意：我们每年扔大量的垃圾。
ton，吨，前面没有具体数字，因此用tons of，大量的，故选C。
【点评】考查固定搭配，注意平时识记。
4．—Dad, about of our classmates wear glasses.—Oh, that's terrible. You all should take good care of your eyes.A. three fourthB. third fourthC. third fourthsD. three quarters【答案】 D【解析】【分析】句意：——爸爸，大约四分之三的同学戴眼镜。
人教版英语英语数词考点+例题-全面解析含答案百度文库
人教版英语英语数词考点+例题-全面解析含答案百度文库一、初中英语数词1．It's the ______ time for me to visit the Shunfeng Park. And I want to visit it a sixth time.A. fifthB. fiveC. fifthsD. the five【答案】 A【解析】【分析】句意：这是我第五次参观顺丰公园，我想第六次去参观。
A序数词，第五，B基数词，五，根据the定冠词可知，定冠词后是序数词，故选A。
【点评】考查数词，注意定冠词后是序数词的用法。
2．—What day is the ______ day of the week?—It's Friday.A. fifthB. fiveC. sixD. sixth【答案】 D【解析】【分析】句意：——一周的第六天是星期几？——星期五。
A.第五；B.五；C.六；D.第六。
星期五是一周的第六天，因此使用sixth，故答案是B。
【点评】考查序数词，追序数词在具体语境中的运用。
3．—Have you heard of the Two-Child policy?—Of course. And I know many couples have new babies in their ______.A. fortiesB. fortiethC. the fortiethD. forty【答案】 A【解析】【分析】句意：——你听说过二胎政策吗？——当然，并且我知道许多夫妇在40岁的时候生婴儿。
根据短语in their forties，在四十多岁，可知比较符合句意，故选A。
【点评】考查介词短语，注意in one's forties的用法。
4．We throw rubbish every year.A. ton ofB. tonsC. tons ofD. a ton of【答案】 C【解析】【分析】句意：我们每年扔大量的垃圾。
新初中英语语法知识—数词的经典测试题附解析(1)
一、选择题1．In China, about ___________ of people live in the country.A．three fifth B．third fifthC．three fifths D．three fives2．—How do your students improve their English writing?—Well, about ______________ of the students like keeping diaries in English in our class. A．two fifth B．two fifths C．second five D．two five 3．There are _______ people in the picture, and the ______ one from the left is me. A．eleven; five B．eleventh; fifth C．eleven; fifth4．--Many young people came to Zhongshan in ______．When did he come to Shenzhen？---When he is an ______ boy，he came here with his parents．A．1980s； eight years oldB．1980s； eight-year-oldC．the 1980s； eight-year-oldD．the 1980s； eight-years-old5．This is my ________ time visit to America. I have never been there before.A．one B．two C．first D．second6．__________ of his time __________ been spent on studies every day.A．Three fourths；has B．Three fourths；haveC．Third fours；has D．Thirds four；have7．Sally, this is ___ time you’ve asked me about that matter. What’s wr ong with you?A．three B．the three C．the third8．— They will need __________ volunteers for 2014 International Horticulture Exposition (国际园艺博览会) in Qingdao.—Let’s go and join them.A．thousand of B．thousands of C．three thousand of D．three thousands 9．I hear ____ foreign students will come to our school and they are in the ____ grade. A．eight, eighth B．eight, eight C．eighth, eighth10．________ trees have been planted near here, so the air is very fresh.A．Two hundreds B．Hundred ofC．Hundreds of D．Hundreds11．About ______ of the land ______ covered with trees and grass.A．three fifths; are B．three fifths ; is C．three fifth; are D．third fifths; is 12．—I hear ________ foreign students will come to our school this year.—Right. They are the ______ exchange students.A．nine; nine B．nineth; nine C．nine; ninth D．nine; nineth 13．—How many people have come to Beijing for the Olympic Games in 2008?—It’s hard to say. _______ people, I think.A．Million of B．Millions of C．Two millions of D．Two million of 14．______of the teachers in our school is 118, ______ of them are women teachers.A．The number; first fourth B．The number; one fourthC．A number; one second D．A number; three quarters15．There are ________ teachers in our school, ________of them are women teachers. A．two hundreds ; three fourth B．two hundred ; three fourthsC．two hundred; three forths D．two hundreds; three fourths16．--- Which is the biggest number of the four?--- ______.A．One third B．A half C．Two thirds D．A quarter17．Li Ming is an active boy student and he always tries his best to make his life colorful though he is in Grade 9. The table below shows that he spends ________ minutes on after-class activities every week.A．250 B．850 C．60018．There are about people in the village.A．eight hundred B．eight hundredsC．eight hundred of D．eight hundreds of19．The number “23,456” can be read as “________”.A．twenty-three thousand, four hundred and fifty-sixB．twenty-three thousand and four hundred fifty-sixC．two three thousand and four five sixD．two three thousand, four and five six20．---Song of Youth is a very popular movie these days.---That’s true. people, especially the young, enjoy watching it.A．Millions of B．Two millions C．Two millions of21．Jim failed twice, but he wanted to have __________ try．A．a second B．a third C．the second D．the third22．of people enjoy the TV play You Come From the Star. And 70% of the music in it very original.A．Three fifth, is B．Three fifth, are C．Three fifths, are D．Three fifths, is 23．We’ve planted ________ trees in the center of our city this year.A．hundred B．hundreds C．hundredth D．hundreds of24．A year is divided into ______ months. September is the _____ month of the year. A．twelve, ninth B．twelve, nineth C．twelfth, ninth D．twelfth, nineth 25．Lesson ____ is so difficult that it will take them _________ to learn it.A．Sixth; two and a half days B．Six; two days and halfC．Sixth; two and a half day D．Six; two days and a half【参考答案】***试卷处理标记，请不要删除一、选择题1．C解析：C【解析】句意：在中国，约五分之三的人生活在农村。
新初中英语语法知识—数词的解析含答案
一、选择题1．Sally, this is ___ time you’ve asked me about that matter. What’s wrong with you? A．three B．the three C．the third2．Two-child policy has been carried out. Most parents are planning to have their child. A．one B．two C．first D．second3．I think we've learnt English words so far.A．hundred of B．nine hundreds C．hundreds of4．—I hear ________ foreign students will come to our school this year.—Right. They are the ______ exchange students.A．nine; nine B．nineth; nine C．nine; ninth D．nine; nineth 5．—Zhapo has a really beautiful beach, doesn't it?—Yes, ________ travelers like to come here for a visit.A．thousands of B．thousand of C．thousand D．three thousands 6．—How old is your sister?—______________.We had a special party for her ______________ birthday yesterday. A．Twenty-one；twenty-first B．Twenty-first；twenty-firstC．Twenty-one；twenty-one D．Twenty-first；twenty-one7．–Hi, Kate! There are floors in this building. Which floor do you live on?–I live on the floor.A．twenty ; twelve B．twenty; twelfth C．twentieth; twelfth 8．——What should we do now, Mr.Li?——Please turn to Page_____and look at the_____picture.A．Twelfth;fifth B．Twelve; fifthC．Twelve;five D．Twelfth;five9．It is reported that people throw ______________ plastic bags along this street every day. A．three hundreds of B．three hundreds C．hundreds of D．hundred of 10．The shoe factory is only about ______ walk from our school.A．half an hour’s B．half and an hour’s C．half an hours’11．--Many young people came to Zhongshan in ______．When did he come to Shenzhen？---When he is an ______ boy，he came here with his parents．A．1980s； eight years oldB．1980s； eight-year-oldC．the 1980s； eight-year-oldD．the 1980s； eight-years-old12．In our city, about ________ of people can get _________ yuan a month.A．three quarters; two thousands B．three quarter; two thousandC．three quarters; two thousand D．three quarter; two thousands 13．Leonardo was born in ________ in Los Angeles. Last year, he won his ________ Oscar in the88th Academy Awards (奥斯卡奖).A．1980；first B．the 1980s；the firstC．1980s；first D．the 1980s；first14．In our class _____ of the students _____ girls.A．third fifths; is B．third fifth; are C．three fifth; is D．three fifths; are 15．— They will need __________ volunteers for 2014 International Horticulture Exposition (国际园艺博览会) in Qingdao.—Let’s go and join them.A．thousand of B．thousands of C．three thousand of D．three thousands 16．Next Friday is my daughter’s birthday. So I will buy her a cake with candles.A．five; fifth B．twelfth; twelve C．nineth; nine17．We can see _________stars in the sky at night in the countryside.A．million of B．three millions of C．millions of D．three million of 18．—We’ll be back for our school’s ___________ anniversary(周年) ceremony.—I see. That means you’ll have a get-together with your classmates in ___________ years. A．twelve; seven B．twelfth; seven C．twelve; seventh D．twelfth; seventh 19．— How was your weekend? —Great ! It was my grandfather’s ______birthday. He was born _____.A．ninety, in the 1920 B．ninetieth, in the 1920sC．the ninetieth, on the 1920s D．nintieth, on the 192020．—Good news! We will have a ________ holiday.—I’ve heard of it. But it’s coming in ________.A．three days; three days’ time B．three days’; three days’C．three-day; three days D．three days; three-day time21．Li Wei bought some school things online at the beginning of the new term, according to the information in the form below, he saved _______ in all.School thingsThe shop nearby¥ 160¥ 30¥ 20¥ 80 Online shop¥ 140¥ 20¥ 15¥ 60A．¥ 55 B．¥ 235 C．¥ 29022．_________ people attending the meeting is 2975 and about _________ are women．A．A number of , one fourth B．The number of, one fourthC．A number of, one fourths D．The number of, one fourths23．My grandparents live in an old apartment with floors and they are on the floor. A．fifth; three B．fifth; third C．five; three D．five;: third24．of people enjoy the TV play You Come From the Star. And 70% of the music in it very original.A．Three fifth, is B．Three fifth, are C．Three fifths, are D．Three fifths, is 25．---I am going to take this summer holiday in Taiwan.---Oh, really? Taiwan is ______ a beautiful island that ______ people in Guangdong go to visit it every year.A．so; thousands B．so; thousands ofC．such; many thousand D．such; thousands of【参考答案】***试卷处理标记，请不要删除一、选择题1．C解析：C【解析】句意：莎莉，这是你第三次问我那个问题。
新初中英语语法知识—数词的技巧及练习题附答案解析(1)
一、选择题1．______of the students in our class ______ going to the summer camp in Beijing next week. A．Two-fifths, are B．Second-fifths, areC．Two-fifths, is D．Second-fifths, is2．There are _______ months in a year. May is the _______ month of a year.A．twelfth; five B．twelve; fifth C．twelve; fiveth D．twelfth; five 3．—How old is your sister?—______________.We had a special party for her ______________ birthday yesterday. A．Twenty-one；twenty-first B．Twenty-first；twenty-firstC．Twenty-one；twenty-one D．Twenty-first；twenty-one4．Mount Tai is so famous that ___ people visit it every day.A．hundred of B．seven hundreds of C．hundreds of D hundreds 5．–Hi, Kate! There are floors in this building. Which floor do you live on?–I live on the floor.A．twenty ; twelve B．twenty; twelfth C．twentieth; twelfth6．﹣Welcome to Los Angeles．Have you ever been here?﹣Sure. I visited this city three years ago so this is my _________ time here.A．first B．second C．third7．——What should we do now, Mr.Li?——Please turn to Page_____and look at the_____picture.A．Twelfth;fifth B．Twelve; fifthC．Twelve;five D．Twelfth;five8．—______________ do you read English newspaper?—At least ______________ a week.A．How long；one B．How often；twiceC．How many；once D．How much；third9．There are _______ people in the picture, and the ______ one from the left is me. A．eleven; five B．eleventh; fifth C．eleven; fifth10．This is my ________ time visit to America. I have never been there before.A．one B．two C．first D．second 11．Every year there are about _______ people waiting for their trains back home in the railway station before Spring Festival comes.A．five thousand of B．five thousand C．thousand of D．five thousands of 12．The __ Winter Olympics will be held in Pyeongchang(平昌)，South Korea on Feb. ____, 2018.A．twenty-three; nine B．twentieth- three; ninethC．twenty-third; ninth D．twentieth-three; ninth13．________of the students in our class________ going to the summer camp in Beijing nextweek.A．Two fifths; are B．Second fifths; are C．Two fifths; is D．Two fifth; are 14．______of the teachers in our school is 118, ______ of them are women teachers.A．The number; first fourth B．The number; one fourthC．A number; one second D．A number; three quarters15．—How old is your grandpa? He looks energetic.—Yeah, it’s hard to imagine he is already in his________ .A．seventies B．seventy C．seventieth D．seventieths 16．— How was your weekend? —Great ! It was my grandfather’s ______birthday. He was born _____.A．ninety, in the 1920 B．ninetieth, in the 1920sC．the ninetieth, on the 1920s D．nintieth, on the 192017．________ runners took part in the half marathon(半程马拉松) in Haikou in April. A．Hundred B．Hundreds C．Hundreds of 18．Thanks to Project Hope, ________ children have better lives.A．thousands of B．thousands C．thousand of19．In China, about ___________ of people live in the country.A．three fifth B．third fifthC．three fifths D．three fives20．Is _________ riding enough for you to get there?A．thirty five minutes B．thirty-five minutes’C．thirty-five-minutes D．thirty five minute’s21．--- Which is the biggest number of the four?--- ______.A．One third B．A half C．Two thirds D．A quarter22．---Song of Youth is a very popular movie these days.---That’s true. people, especially the young, enjoy watching it.A．Millions of B．Two millions C．Two millions of23．_________ people attending the meeting is 2975 and about _________ are women．A．A number of , one fourth B．The number of, one fourthC．A number of, one fourths D．The number of, one fourths24．There are ________ people in the supermarket. It's so crowded.A．hundred B．hundreds C．hundred of D．hundreds of 25．— They will need __________ volunteers for 2014 International Horticulture Exposition (国际园艺博览会) in Qingdao.—Let’s go and join them.A．thousand of B．thousands of C．three thousand of D．three thousands 【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【解析】句意：我们班五分之二的学生将要去下周在北京的夏令营。
初中英语数词讲解及练习(含答案)
▲掌握分数、时间、日期的表达法。
【复习要点】（一）基数词基数词用来表示数目，或者说表示数量的词叫基数词。
最基本的基数词如下表所示。
1 11 100 a2 12 20 1000 a3 13 30 1，000，000 a4 14 40 10，000，0005 15 50 100，000，000 a6 16 60 1，000，000，000 a7 17 708 18 809 19 9010说明：1．13—19是由个位数加后缀构成。
注意其中13、15的拼写是和。
2．20—90由个位数加后缀构成，注意其中20—50的拼写分别是, , 和;80的拼写是。
3．其它非整十的两位数21—99是由整十位数加连字符“-”，再加个位数构成。
如：81 。
4．101—999的基数词先写百位数，后加再写十位数和个位数。
如：691 。
5．1000以上的基数词先写千位数，后写百位数，再加，最后写十位数和个位数。
如：5893 。
在基数词中只有表示“百”、“千”的单位词，没有单独表示“万”、“亿”的单位词，而是用（千）和（百万）来表达，其换算关系为：1万=10 ;1亿=100 ; 10亿。
6．多位数的读法：1）1000以上的多位数，要使用计数间隔或逗号“，”。
即从个位起，每隔三位加一个间隔或逗号。
第一个间隔或逗号前是（千），第二个间隔或逗号前是（百万），第三个间隔或逗号前是a 或a (十亿)。
2）每隔三位分段以后就都成了101—999。
读的时候十位数（或个位数）的前面一般要加。
如：888，000，000读作：。
基数词的用法：1. 基数词在句中的作用基数词的作用相当于名词和形容词，在句中可作定语、主语、宾语（介宾）、表语、同位语等。
例如： . 3+5=8 （作表语）?你要多少桔子？I . 我要八个。
（作宾语） . 湖里有八条小船。
（作定语）2．, , , , 这些词前面如有表示具体数字的词，它们不能加“s”,反之则须加“s”, 并要与短语连用。
数词考点解析(Word版附答案)
【初中英语】数词考点解析（Word版附答案）一、初中英语数词1．In our class of the students girls.A. third fifths; isB. third fifth; areC. three fifth; isD. three fifths; are【答案】 D【解析】【分析】句意：我们班五分之三的学生是女生。
分数表达方式：分子要用基数词，分母要用序数词，当分子超过一时，分母后要加s。
五分之三的正确表达是three fifths；带有分数的短语作主语时，谓语动词由分数后面的名词形式来决定，students是复数形式，谓语动词要用are，故选D。
【点评】考查分数的基本构成。
注意其作主语时谓语动词形式的选择。
2．When Huawei P20 came out, ______ people couldn't wait to buy one in our town.A. thousandB. thousandsC. thousand ofD. thousands of【答案】 D【解析】【分析】句意：当华为P20上市时，成千上万的人迫不及待地想在我们镇上买一台。
thousand，千，其前有具体数词修饰时，用其单数形式，当其前没有具体数词修饰时，用其复数形式，且和of连用，thousands of，成千上万，这里没有具体数词修饰，故选D。
【点评】考查整数的表达。
注意识记thousand的用法。
3．______ of the students in our school are boys.A. Two threeB. Second threeC. Two thirdsD. Two third【答案】 C【解析】【分析】句意：我们学校的学生中有三分之二是男生。
分数词是分子是基数词，分母是序数词，分子大于一，分母加s，因此二分之一是two thirds，故选C。
【点评】考查分数，注意分子是基数词，分母是序数词，分子大于一，分母加s的用法。
人教版英语初二英语英语数词知识点总结含答案解析百度文库
人教版英语初二英语英语数词知识点总结含答案解析百度文库一、初中英语数词1．There are people in Dale's family. They live on the floor.A. five; nineB. fifth; nineC. five; ninthD. fifth; ninth【答案】 C【解析】【分析】句意：在戴尔的家里有五个人。
他们住在九楼。
基数词放在名词前修饰名词，表示数量，因此用five；序数词放在floor前面表示顺序，因此用ninth，故选C。
【点评】此题考查数词。
注意基数词和序数词的使用规则。
2．Did you know that the earth is home to ______ animals?A. millionB. millionsC. million ofD. millions of【答案】 D【解析】【分析】句意：你知道地球是几百万动物的家园吗？millions of，固定搭配，几百万的；数词+million，表示具体的……百万，此时million是单数形式；空前没有具体数词，因此用millions of，故选D。
【点评】考查数词，注意millions of的用法。
3．_______, when Marx was already _______, he found it was important to study the situation in Russia, so he began to learn Russian.A. In 1870s, in his fiftiesB. In 1870s, in fiftiesC. In the 1870s, in fiftiesD. In the 1870s, in his fifties【答案】 D【解析】【分析】句意：在十九世纪七十年代，马克思已经五十岁了，他觉得研究俄国的形势很重要，便开始学习俄语。
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一、选择题1．---How many teachers are there in your school?---Over four______. And ______ of them are women teachers.A．hundred, two-thirds B．hundred, two-thirdC．hundreds, two-thirds D．hundreds, two-third2．About _____________ of the students this year were born in the 1990s.A．three five B．three fifths C．third fifths D．third fifth3．Two-child policy has been carried out. Most parents are planning to have their child. A．one B．two C．first D．second4．The old man began to learn to drive a car at the age of _______．A．sixty B．the sixtieth C．sixty years old D．sixties5．There are _______ months in a year. May is the _______ month of a year.A．twelfth; five B．twelve; fifth C．twelve; fiveth D．twelfth; five 6．Mount Tai is so famous that ___ people visit it every day.A．hundred of B．seven hundreds of C．hundreds of D hundreds 7．– Good news. My good friend has just moved to my flat. He lives on the floor.– We are neighbors. We live on the 19th floor. He lives one floor above us.A．twelve B．twelfth C．twenty D．twentieth8．–Hi, Kate! There are floors in this building. Which floor do you live on?–I live on the floor.A．twenty ; twelve B．twenty; twelfth C．twentieth; twelfth9．The shoe factory is only about ______ walk from our school.A．half an hour’s B．half and an hour’s C．half an hours’10．_______ of the teachers in our school _________women teachers.A．Two thirds,are B．Third Second,is C．Two thirds,is11．Next Friday is my daughter’s birthday. So I will buy her a cake with candles. A．five; fifth B．twelfth; twelve C．nineth; nine12．There are ____ floors in this building, and my flat is on the ____ floor.A．ten; five B．tenth; fiveC．tenth; fifth D．ten; fifth13．— How was your weekend? —Great ! It was my grandfather’s ______birthday. He was born _____.A．ninety, in the 1920 B．ninetieth, in the 1920sC．the ninetieth, on the 1920s D．nintieth, on the 192014．Two________foreign visitors________to the opening ceremony last Saturday. A．hundred; were invited B．hundred; had been invitedC．hundreds of; are invited D．hundreds of; have been invited15．I didn’t know Miss Yang was years old until she told me about that.A．fifty B．fifties C．fiftieth16．—What do you think of the environment here?—Wonderful! of the land is covered with trees and grass.A．Two fifths B．Two fifth C．Second fifths D．Second fifth 17．In China, about ___________ of people live in the country.A．three fifth B．third fifthC．three fifths D．three fives18．--- Which is the biggest number of the four?--- ______.A．One third B．A half C．Two thirds D．A quarter 19．Sally, this is _____ time you’ve asked me about that matter. What’s wrong with you? A．three B．the three C．third D．the third 20．The number “23,456” can be read as “________”.A．twenty-three thousand, four hundred and fifty-sixB．twenty-three thousand and four hundred fifty-sixC．two three thousand and four five sixD．two three thousand, four and five six21．Jim failed twice, but he wanted to have __________ try．A．a second B．a third C．the second D．the third 22．_________ people attending the meeting is 2975 and about _________ are women．A．A number of , one fourth B．The number of, one fourthC．A number of, one fourths D．The number of, one fourths23．of people enjoy the TV play You Come From the Star. And 70% of the music in it very original.A．Three fifth, is B．Three fifth, are C．Three fifths, are D．Three fifths, is 24．There are ________ people in the supermarket. It's so crowded.A．hundred B．hundreds C．hundred of D．hundreds of 25．—We’ll be back for our school’s ___________ anniversary(周年) ceremony.—I see. That means you’ll have a get-together with your classmates in ___________ years. A．twelve; seven B．twelfth; seven C．twelve; seventh D．twelfth; seventh【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【解析】试题分析：句意：--在你们学校有多少老师？--四百多。
他们中的三分之二是女老师。
Hundred前面有具体数字的时候不能变复数；分数的表达法，分子用基数词，分母用序数词，当分子超过一的时候，分母用复数的形式，结合语境，故选A。
考点：考查数词的用法。
2．B解析：B【解析】试题分析：句意：今年大约有五分之三的的学生是20世纪90年代出生。
在英语中的分数，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。
所以选B。
考点：考查数词。
3．D解析：D【解析】句意：二胎政策已经实施了，许多父母计划生他们的第二个孩子了。
A. one一，基数词；Ｂ.two二，基数词；C. first第一，序数词；D. second第二，序数词。
二胎政策出台后，家长们想要第二个孩子，第二：second。
故选Ｄ。
点睛：基数词表示“数量”，意思是“几”；序数词表示“顺序”，意思是“第几”。
4．A解析：A【解析】句意：这个老人在60岁的时候开始学习开车。
sixty六十；the sixtieth第六十个；sixty years old六十岁，常在句中做表语；sixties六十多岁，常用于短语in one’s sixties，表示在某人六十多岁的时候。
at the age of…表示在…岁的时候，后面直接跟基数词，故应选A。
5．B解析：B【解析】句意：一年有十二个月。
五月是一年中的第五个月。
第一空修饰复数名词months，表示十二个，故用基数词twelve。
第二空修饰单数名词month，表示第五，故用序数词fifth。
故选B。
6．C解析：C【解析】句意：泰山如此出名以至于每天成百上千的人们游览它。
hundred百，有具体数词修饰，表示具体数时，不加s，表示约数，与of连用，后面加s。