课件17张PPT。第25讲 数 词中考对数词的考查主要有以下四点：
1．基数词和序数词的用法；
2．日期、时间、年龄、编号等的用法；
3．分数的表达；
4．hundred，thousand，million，billion的用法。1．基数词的构成
①1～12独立成词：one，two，three，four，five，six，seven，eight，nine，ten，eleven，twelve。
②13～19的基数词以-teen结尾。要注意thirteen，fifteen，eighteen的拼写。
③表示整“十”的基数词：20～90的基数词都以-ty结尾。其中特别要注意twenty，thirty，forty，fifty，ninety的正确写法。
④21～99的写法是：十位数加个位数，中间用连字符号“-”连接。如：26 twenty-six；57 fifty-seven。
⑤101～999的构成是：百位数与十位数之间用and连接。如：123 one hundred and twenty-three。
⑥hundred，thousand，million，billion等词在表示确定数目的时候，直接在前面加基数词；表示不确定数目时，要在它们后面加s，其后还要加of。如：
three hundred students三百名学生
thousands of students成千上万的学生高频考向一 基数词2．基数词的用法
①表示数量的多少。
②表示年份。1988读作nineteen eighty-eight
③表示时刻。7：00读作seven o'clock
8：30读作half past eight/eight thirty
3：05读作five past three/three five
5：48读作twelve to six/five forty-eight
④表示顺序。单数名词＋基数词，名词的第一个字母通常要大写。如：
Class Two；Room 12；No.3 Middle School
注：“单数名词＋基数词”可转换成“the＋序数词＋单数名词”，此时名词的第一个字母不大写。如：
Lesson Three＝the third lesson。高频考向一 基数词⑤“数词＋单数名词”相当于合成形容词作定语(如：a three-year-old girl)。合成形容词中的名词一定是单数。合成形容词不能作表语，后面必须跟所修饰的名词。
⑥与表示时间、距离、长度的名词一起构成“数词＋单位名词＋形容词”，表示事物的形状、年代及距离等。如：ten years old，3600 meters long。
⑦“几十”的基数词复数形式可用来表示某人约几十岁或年代。如：
In his sixties，he rode a bike round the world.
The light was invented in the 1870s.
⑧与another，more连用时，表示在已有基础上再增加—定数量。如：
another three hours，two more cakes。高频考向一 基数词【例1】 A quarter to four is ________.(2015，张家界)
A．3：15 B．3：45 C．4：15
解析：a quarter to four表示四点差一刻，即3：45。
答案：____
【例2】 Please turn to page ________ and take a look at the picture on it.(2016，广东)
A．the eightieth B．eighty
C．eighties D．eightieth
解析：结合题干和选项可知，此处应用数词构成编号，结构应为“page＋基数词”。
答案：____高频考向一 基数词BB【例3】 Tony's mum looks young and beautiful.It's hard to imagine she is already in her ________.(2015，苏州)
A．fifties B．fifty C．fiftieths D．fiftieth
解析：表示某人约几十岁的时候，应用基数词的复数形式。
答案：____高频考向一 基数词A1．序数词的构成
①序数词多数是由“基数词＋th”构成。如：six→sixth，seven→seventh等。
②以y结尾的整十的数词，先将y改为i，再加-eth。如：fifty→fiftieth，seventy→seventieth等。
③21以上的非整十的数词，将末位数(即个位数)改为序数词，其他的位数仍用基数词。如：
twenty-one→twenty-first，thirty-two→thirty-second，two hundred and ninety-eight→two hundred and ninety-eighth等。
④少数的序数词属于特殊情况，而且这类词也常常是考点，大家要特别注意记忆。如：
one→first，two→second，three→third，five→fifth，eight→eighth，twelve→twelfth。
注：fourteenth(第十四)，fortieth(第四十)，ninth(第九)，nineteenth(第十九)，ninetieth(第九十)。高频考向二 序数词2．序数词的用法
①表示顺序。序数词表顺序时，其前须用定冠词the，后接单数名词。
如：I'm the first one to arrive here.
注：如序数词前出现人称代词，则不加the。定语从句中先行词之前有序数词时，则关系代词只能用that。如：
Today is my thirtieth birthday.
②用于最高级前。如：
John is the second tallest boy in our class.
③分数。分子用基数词，分母用序数词。分子为1，分母用单数，分子大于1，分母用复数。如：
one fifth，three fifths。
—些习惯用法：1/4也可表示为a quarter，3/4也可表示为three quarters，1/2也可表示为a half。高频考向二 序数词④带分数的词组作句子的主语时，谓语动词的单复数与分数后的名词保持一致。如：
Two fifths of the apple is eaten.这个苹果被吃了五分之二。
Two fifths of the apples are red.五分之二的苹果是红的。
⑤表示数量上再增加“一”，用：a(an)＋序数词＋单数名词。如：
She had a second child.她有了第二个孩子。高频考向二 序数词【例4】—The________Brazil's Olympic games will be held on August 5.(2016，咸宁)
—________exciting news for the long summer vacation!
A．thirty-one；How a B．thirty-first；What
C．thirty-first；What an D．thirty-one；How
解析：句意：——第三十一届巴西奥运会将在8月5日举行。——对于漫长的暑假来说，这是多么激动人心的消息啊！第一空作定语，修饰名词，表示次数，故用序数词thirty-first。感叹句的结构：What＋形容词＋名词＋主谓语！How＋形容词/副词＋主语＋谓语！第二空是感叹句，修饰名词短语exciting news，故用词what。
答案：____高频考向二 序数词B【例5】 Kate is a school girl.She got many presents on her ________ birthday.(2015，凉山)
A．nine B．the ninth
C．ninetieth D．ninth
解析：表示某人的第几个生日应用序数词，且前面已有代词修饰，故不能再用定冠词。
答案：____高频考向二 序数词D①hundred，thousand，million，billion的运用。在构成具体的数字时，用单数形式。如：two hundred students，表达不具体的多数时用其复数。如：thousands of students(成千上万的学生)。
②与another，more连用时，表示在已有基础上再增加一定数量。如：another three hours或three more hours。
③“一两天”可表达为：a day or two或one or two days；
有关“半”的表达：three years and a half或three and a half years三年半；half an hour半小时；one hour and a half/one and a half hours一个半小时。高频考向三 数词中的难点【例6】It's reported that people throw ________ plastic bags along this street every day.(2015，南充)
A．hundred B．hundreds
C．hundred of D．hundreds of
解析：hundreds of为固定结构，意为“许多的；大量的”。
答案：____高频考向三 数词中的难点D【例7】________ Kobe’s fans watched his final match and ________ of them were men.(2016，乌鲁木齐)
A．Million of；three fourths
B．Three millions；third four
C．Millions of；three fourths
D．Three million；third fours
解析：当表达分数时，分子用基数词，分母用序数词。分子大于1时，分母(序数词)加-s。million与具体数字连用时，其后不加-s，也不加of；million与of连用时，表示不确切的数目，其后加-s。
答案：____高频考向三 数词中的难点C考点跟踪突破25 数词
1．More than two __A__ trees are planted in our neighborhood every year.(2016，淮安)
A．hundred B．hundreds
C．hundreds of D．hundred of
2．There are __C__ tourists visiting the island on May Day every year.(2016，新疆)
A．two thousands of B．two thousands
C．thousands of D．thousand of
3．Meimei is going to be an older sister.Her parents are planning to have their __D__ child.(2016，重庆)
A．one B．two C．first D．second
4．—Welcome to Los Angeles.Have you ever been here?
—Sure.I visited this city three years ago so this is my __B__ time here.(2016，温州)
A．first B．second C．third D．fourth
5．There are __C__ doctors in this hospital，________ of them are women doctors.
A．two hundred，two fifth
B．two hundreds，two fifth
C．two hundred，two fifths
D．two hundreds，two fifths
6．In this test，we're asked to write a passage of about __C__.
A．80-words B．80-word
C．80 words D．80 words'
7．The workers will complete the new bridge in __A__．(2016，郴州)
A．two and a half months
B．two months and half
C．two and a half month
8．—Excuse me，sir.Here's a package for Lin Tao.Which room does he live in?
—__B__．
A．380 Room B．Room 380
C．The Room 308 D．The 308 Room
9．—“Food Safety” has become one of the hottest topics recently.
—Yeah，it receives __C__ Internet hits(点击) a day.
A．thousands B．thousand of
C．thousands of D．ten thousands
10．They are the students of __B__．
A．grade 7 B．Grade 7
C．7th grade D．Grade 7th
11．—How was your weekend?
—Great！It was my grandfather's __B__ birthday.We enjoyed ourselves.
A．seventy B．seventieth
C．the seventieth D．seventeenth
12．The number of the cars in our neighbourhood is about eight __A__，and ________ of them are new cars.
A．hundred；two thirds B．hundred；two third
C．hundreds；two thirds D．hundreds；two third
13．—Is this your __C__ visit to my hometown，Zhengzhou?
—No，I've been here for many times.
A．one B．the first
C．first D．once
14．—We will have a __A__ holiday next month，let's have a trip to Mount Emei.
—That's great.
A．three-day B．three-days C．three-days'
15．There are __B__ days in a year.
A．three hundred sixty and five
B．three hundred and sixty-five
C．three hundreds and sixty-five
D．three hundreds sixty-five
16．—How many hours do you sleep every night?
—About __A__ hours from 9：00 p．m to 6：00 a．m.(2016，济南)
A．nine B．nineteen C．ninth D．ninety
17．__D__，my grandfather was a worker in a shoe factory.
A．In 1970's B．In 1970s
C．In the 1970s' D．In the 1970s
18．Tom，a __C__ boy，can speak English quite well.He wants to learn ________ language next term.
A．twelve-years-old；second
B．twelve year old；the second
C．twelve-year-old；a second
19．—Excuse me.How many students in your class want to work as teachers in the future?
—__A__．
A．Twelve B．The twelve
C．Twelfth D．The twelfth
20．—I've cut the cake into __D__ pieces.Which piece do you want?
—The ________ one.
A．five；two B．fifth；two
C．fifth；second D．five；second
