课件18张PPT。专题四 数 词1．常考的基数词和序数词对照表基数词和序数词考点一2．基数词的用法
(1)表示数量(2)表示时刻(过past，差to读法)(3)表加，减，乘，除(等号是equals/is)(4)具体日期(年，月，日)：1949,10,1读作on October first nineteen forty-nine。
(5)……世纪……年代：in the 1980's读作in the nineteen eighties，意为“在20世纪80年代”。
(6)“基数词＋单数名词”相当于复合形容词，作名词的定语，用于表示时间、距离等。eg.
the 100-metre race 100米赛跑
a ten-minute walk 10分钟的路程
(7)“in one's＋整十的复数”表示在“在某人……多岁时”。eg.
in his forties 在他四十多岁的时候3．序数词的用法
(1)序数词在使用时，通常前面要加定冠词the，但是如果序数词前出现不定冠词a或an时，则表示“再一； 又一”。eg.
We'll go over it a second time.我们得再检查第二遍。
We've tried it three times.Must we try it a fourth time？我们已经试过三遍了，还必须再试一次(第四次)吗？
(2)基数词也可以表示顺序。只需将基数词放在它所修饰的名词之后即可，不需要添加定冠词。eg.
the first lesson＝Lesson One 第一课
the fifth page＝Page 5(Five) 第五页
the twenty-first room＝Room 21(Twenty-one) 21号房间1．表示确切的数字(具体数字＋概数词＋名词复数)
hundred，thousand，million等词与具体的数字one，two…或several，some，many等连用，要用单数形式。eg.
five hundred people 500人
two thousand books 两千本书
several million trees 几百万棵树概数词考点二
2．表示不确切的数字(概数词加s＋of＋名词复数)
hundred，thousand，million等词与of连用，要用复数形式，但前面不能再加数字。eg.
thousands of factories成千上万家工厂
1．三个分数的两种读法
1/2：one second a half
1/4：one fourth a quarter
3/4：three fourths three quarters
2．“分数＋of＋名词”作主语时，谓语动词的单复数要以of后的名词为准。eg.
Three quarters of the teachers are women teachers, and one fourth of the teachers are men teachers in our school. 我们学校四分之三是女老师，四分之一是男老师。分数的用法考点三3．“半”的表示法
(1)“half of＋名词”作主语，谓语动词的单复数以of后名词为准。eg.
Half of the students are from foreign countries. 有二分之一的学生来自外国。
Half of the housework is done. 做了二分之一的家务。
(2)“1.5＋名词”作主语，谓语动词常用单数形式。eg.
Don't worry.There is still one and a half hours/one hour and a half left now. 不要担心。还有1.5小时。谢谢观看！第二部分 专题四
Ⅰ.单项填空
(C )1.This is Mr White's ________ visit to Beijing. He has been there twice before.
A．two B．second
C．third D．three
(A )2.The old man began to learn English at the age of________.
A．sixty B．sixties
C．sixty-year-old D．sixty years old
【精析】考查基数词的用法。at the age of＋基数词，表示“在……岁时”。
(C )3.Today is my mother's________ birthday. I will buy her a gift.
A．fourteen B．fourteenth
C．fortieth D．four
【精析】考查序数词的用法。表示序列时用序数词，序数词前用定冠词the，若序数词前面有形容词性物主代词或名词所有格修饰时，不再用任何冠词，并由句意可知“今天是我妈妈的四十岁生日”应用fortieth，故选C。
(B )4.He has failed seven times, but he wants to try a ________ time.
A．eight B．eighth
C．eighteeth D．eighty
【精析】考查序数词的用法。表示“再一，又一”含义时应用“不定冠词a或an＋序数词”。句意为“他已经失败了七次，但他还想再尝试一次”。故选B。
(C )5.My uncle wrote five books in his________.
A．seventy B．seventieth
C．seventies D．seventeenth
【精析】考查岁数的表达。表示“在某人多少岁数的时候”应用“in＋整十的复数”，故选C。
Ⅱ.根据句意，用括号中所给词的适当形式填空
6．Please, turn to page __nine__ and look at the picture.(nine)
7．Today is John's __fifth__ birthday. He received many presents.(five)
8．There are seven days in a week and Friday is the __sixth__ day of the week.(six)
9．Rose lives on the __twentieth__ floor. It's too high, so she has to take a lift every day.(twenty)
10．The __second__ Youth Olympic Games was held in Nanjing on August 16, 2014.(two)
单项填空
(B )1.—How many teachers are there in your school?
—About four________.
A．hundreds of B．hundred
C．hundreds D．hundred of
(C )2.Guilin is becoming more and more beautiful，and________foreign travelers come to visit it every year.
A．thousands B．thousand of
C．thousands of D．thousand
(A )3.________books were sent to a poor mountain village school by the volunteers before New Year.
A．Millions of B．Million
C．Millions D．Million of
单项填空
(A )1.Over________ of the articles on education have been published.
A．two thirds B．two third
C．seconds three D．seconds third
【精析】考查分数的表达。分数的构成：分子是基数词，分母是序数词；分子大于一时，分母加-s。
(C )2.About________ of the surface of the earth________covered with water.
A．three quarter; is B．three quarters; has
C．three quarters; is D．three quarter; are
