About 61 percent of the surface is covered by water. 大約61%的表面被水覆蓋著。
�。�12）小數(shù)的讀法：小數(shù)點(diǎn)讀作"point"，小數(shù)后各位數(shù)要分別讀， 小數(shù)點(diǎn)前的數(shù)若為"0"可略去不讀。
Examples： 2.468 讀作：two point four six eight
0.157 讀作：（zero）point one five seven
II 序數(shù)詞
1.序數(shù)詞的構(gòu)成
�。�1）一般在基數(shù)詞后加th
eg.four→fourth,thirteen→thirteenth
�。�2）不規(guī)則變化
one→first, two→second, three→third, five→fifth,eight→eighth,
nine→ninth,twelve——twelfth
�。�3）以y結(jié)尾的十位整數(shù)，變y為ie再加th
twenty→twentieth, forty→fortieth, ninety→ninetieth
�。�4）從二十一后的“幾十幾”直至“幾百幾十幾”或“幾千幾百幾十幾”只將個(gè)位的基數(shù)詞變?yōu)樾驍?shù)詞。
twenty-first,two hundred and forty-fifth
2.序數(shù)詞的用法
�。�1）序數(shù)詞作定語(yǔ)時(shí)，一般要與定冠詞或物主代詞連用。
eg.Tom is their second son.
He is the first one to come here.
（2）序數(shù)詞有時(shí)可與不定冠詞連用，表示數(shù)量上“又—”,“再一”
eg： He tried a second time.他又試了—次。
Shall l ask him a third time？還要我再問(wèn)他—次嗎？我已問(wèn)了他兩次）
（3）序數(shù)詞的縮寫(xiě)形式為：阿拉伯?dāng)?shù)字加上這個(gè)詞的末尾兩個(gè)字母。
1st 2nd,3rd,4th,20th,21st,22nd,23rd
�。�4）表示年、月、日時(shí)，年用基數(shù)詞，日用序數(shù)詞。
2005年8月15日：（英）15,8,2005=15th,August,2005；（美）8,15,2005=August 15th,2005
III基數(shù)詞和序數(shù)詞都可以用來(lái)給數(shù)字編號(hào)
The first lesson=Lesson Two（第二課）
第305房間：Room three o（零）five
長(zhǎng)安街76號(hào)：seventy-six Changan Street
電話號(hào)碼：204-2244：telephone number two o（零） four two two（double two four four
十一路公共汽車(chē)：Bus（No.） eleven
IV分?jǐn)?shù)詞的表達(dá)
分子用基數(shù)詞，分母用序數(shù)詞，分子大于1時(shí)，分母加s
eg.1／3-one third；2／5-two fifths
V數(shù)學(xué)運(yùn)算的表達(dá)
eg.3+5=8 Three plus／and five is eight.
9-2=7 Nine minus two is seven.
6x5=30 Five times six is thirty ／six unutilized five is thirty.
8÷2=4 Eight divided by two is four.
VI倍數(shù)表示法
a. 主語(yǔ)+謂語(yǔ)+倍數(shù)（或分?jǐn)?shù)）+ as + adj. + as
I have three times as many as you. 我有你三倍那么多。
b. 主語(yǔ)+謂語(yǔ)+倍數(shù)（分?jǐn)?shù)）+ the size (amount，length…) of…
The earth is 49 times the size of the moon. 地球是月球的49倍。
c. 主語(yǔ)+謂語(yǔ)+倍數(shù)（分?jǐn)?shù)）+ 形容詞（副詞）比較級(jí)+ than…
The grain output is 8 percent higher this year than that of last year.
今年比去年糧食產(chǎn)量增加8%。
d. 還可以用by+倍數(shù)，表示增加多少倍
The production of grain has been increased by four times this year.
今年糧食產(chǎn)量增加了4倍。
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