第四節(jié)  數(shù)   詞（3-3~4-1）

　　大綱要求

　　基數(shù)詞及其用法；序數(shù)詞的構(gòu)成及其用法；分?jǐn)?shù)詞的構(gòu)成；小數(shù)的用法。

　　一、基數(shù)詞及其主要用法

　　表示數(shù)目的詞稱基數(shù)詞。15 fifteen，幾百幾千不加s，242  two hundred and forty-two，5058 five thousand and fifty-eight，9，600，000 nine million six hundred thousand

　　1.基數(shù)詞可以用于數(shù)字的計(jì)算。

　　6+8=14 Six plus eight is fourteen.

　　9-7=2  Nine minus seven is two.

　　7X5= 35 Seven times five is thirty-five.

　　8÷4=2 Eight divided by four is two.

　　2.基數(shù)詞可以表示人的大致年齡和年代。

　　He died in his fifties.

　　This took place in 1990s/1990s.

　　The professor became successful in his thirties.

　　3.基數(shù)詞可以用來表達(dá)年份、時(shí)間、電話號(hào)碼。

　　1700 seventeen hundred

　　1814 eighteen fourteen

　　9：20 nine twenty

　　11：30 eleven thirty/ half past eleven

　　5：45 five forty-five/ a quarter to six

　　88760231 eight eight seven， six zero two， three one

　　4.基數(shù)詞可以用于編號(hào)。

　　Number six， line 4， page 19， Bus（No.） 332， Platform （No.） 5， Room 101

　　5.基數(shù)詞可以和其他詞一起構(gòu)成合成形容詞，在句子中作定語。

　　A one-month-old baby can recognize its mother by smell.

　　This eleven-month-old baby can speak a few words.

　�。═he baby is eleven months old.）

　　The teacher asked us to write a four-thousand-word essay as our homework.

　�。═here are four thousand words in the essay.）

　　This four-paragraph essay is too difficult for me to understand.

　�。═here are four paragraphs in this essay. ）

　　二、序數(shù)詞及其主要用法

　　表示順序的詞稱為序數(shù)詞。如first， second， third， fourth， ninth， twenty-first， forty-fifth等。

　　序數(shù)詞可以用來表示日期和世紀(jì)。May the first / the first of May（5.1）， August the eighth / the eighth of August（8.8）， the twentieth century， the twenty-first century

　　序數(shù)詞在句子中前面一般加the

　　The first of October is our National Day.

　　She was the third to arrive.

　　序數(shù)詞在句子中前面加不定冠詞，表示“再一”又一“。

　　Theyll have to do it a second time.

　　Shall I ask him a third time？

　　When he sat down ， a fourth man rose to ask.

　　三、分?jǐn)?shù)詞的構(gòu)成

　　分?jǐn)?shù)的分子用基數(shù)詞表示，分母用序數(shù)詞表示，若分子大于1，分母需用復(fù)數(shù)。

　　two-thirds（2/3），one-third（1/3）， nine-tenths （9/10）， five-twelfths（5/12）。

　　特殊表達(dá)法有：one half （1/2），a quarter （1/4）， three quarters （3/4） .

　　考試重點(diǎn)

　　基數(shù)詞可以和其他詞一起構(gòu)成合成形容詞，在句子中作定語，名詞不能加s.

　　數(shù)詞部分需特別注意dozen， hundred， million， billion 等詞。表示具體數(shù)字時(shí)，這些詞用單數(shù)形式，表示不具體的數(shù)字時(shí)，須用dozens of， hundreds of 這類的結(jié)構(gòu)。

　　I want three dozen of these.

　　He has been there dozens of times.

　　It is reported that _____ people in this area were saved in the storm.

　　A. hundred     B. hundred of     C. hundreds of        D. some    hundreds

　�。ù鸢� C）

　　當(dāng)數(shù)詞與名詞及其他詞構(gòu)成合成形容詞時(shí)，合成形容詞中間若用連字符，則其中的名詞須用單數(shù)形式。

　　The homework for the next period is to write a two-hundred-word composition about your hometown.

　　Mary is a eleven-year-old girl.

　　（Mary is eleven years old.）

　　典型例題

　　1. In ______ century computers will be used more widely.

　　A. twenty-one     B. the twenty-one   C. twenty-first    D. the twenty-first

　　序數(shù)詞前加the.

　　答案 D

　　2. The meeting will be held in _______ .

　　A. 112 Room   B. Room 112          C. the 112 Room   D. the Room 112

　　答案 B

　　3. The Great Wall of China is about 6，700 _______.

　　A. kilometer long            B. kilometers long

　　C. kilometer longer             D. kilometers longer

　　答案 B

　　4. “How many presidents were there before Abraham Lincoln？”

　　“Fifteen， so he was ______.”

　　A. the sixteen president         B. the sixteenth  president

　　C. president sixteen              D. president the sixteenth

　　the sixteenth president 第十六任總統(tǒng)

　　答案 B

　　5. “What did the professor tell you to do？”

　　“I had to write a ______ report. ”

　　A. two thousand words       B. two-thousands-word

　　C. two-thousand-word        D. two-thousand words

　　答案 C

　　6. “Did you buy anything at the clothing sale？”

　　“Yes， I bought three _____ ties for just twelve dollars.”

　　A. five dollars   B. five-dollars   C. five-dollar   D. fifth dollar

　　答案 C

　　7. Eight minus three _______ five.

　　A. leave     B. leaves        C. left         D. has left

　　一般現(xiàn)在時(shí)

　　答案 B

　　8. What date is it ？ Its ________.

　　A. July twentieth-first             B. July the twenty-first

　　C. the twenty-first of July        D. Both B and C

　　7月21日：July the twenty-first

　　the twenty-first of July

　　答案：D

　　9. When he was in his ________， he got the chance to go abroad to study.

　　A. forty                     B. fortys

　　C. fortys years old        D. forties

　　答案：D

　　10. “Rex told me you have moved.”

　　“Yes， into a _______.”

　　A. two-storey house           B. house of two story

　　C. house of two stories        D. two-stories house

　　答案：A

　　11. “I would like to register this letter.”

　　“Please go to _______ on your left.”

　　A. third window             B. window third

　　C. the window three        D. the third window

　　register  掛號(hào)，郵寄

　　答案：D

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