U4 Numbers
要紧词语
1 accurate adj. 准确的 2 electronic adj. 电子的
3 powerful adj. 强有力的 4 whole adj. 全部的；整体的
5 living adj. 活的 6 human adj. 人的
7 following adj. 下述的；下列的 8 amazing adj. 让人惊奇的
9 especially adv. 特别地 10 nearly adv. 接近
11 degree n. 度 12 brain n. 脑
13 part n. 部位； 14 language n. 语言
15 system n. 系统 16 invention n. 创造
17 abacus n. 算盘 18 calculator n. 计算器
19 percentage n. 百分比 20 square root n. 平方根
21 calculation n. 计算 22 lifetime n. 一生；终生
23 lightning n. 闪电 24 power n. 能量，力量
25 program "n.">要紧短语及句型
1.odd numbers 奇数
2.even numbers 偶数
3.calculate percentages and square roots 计算百分比和平方根
4.call the brain a living computer 把人脑称为一台活电脑
5.turn on/off your mobile phone 打开/关上你的手机
6.in our daily life 在大家的日常
7.an international language 一种国际语言
8.add A to B 把A加到B
9.at least 最起码，最少
at most 最多
10.in ancient times 在古时候
11.in many different ways 用不少不一样的方法
in the same way 用相同的方法
12.count in tens 以十进制的办法数数
13.the system of numbers 数字系统
14.developing country 进步中国家
developed country 发达国家
with the development of … 伴随……的进步
15.make it easier to write 使书写更简单
16.in your whole lifetime 在你的一生中
17.brain against computer 大脑对决电脑
18.the following story 下列的故事
19.with an amazing brain 带有让人惊异的大脑
20.fifty seconds 50秒
21. in a flash 一瞬间
22.be like lightning 闪电般地，飞快地
23.powerful calculating machines 有效的计算工具
24.programme the computer with instructions 用指令给电脑编程
25.4 plus 3 equals/ is 7. 4加3等于7。
26.5 minus 3 equals/ is 2. 5减3等于2
27.a modern electronic calculator 一只现代的电子计算器
28.a great inventor 一位伟大的创造家
29.an important invention 一个要紧的创造
30.add… and… 把……和……加起来
subtract …from … 把……减去……
multiply … by … 把……乘以……
divide … by 把……除以……
词性转换:
原词 | 可能的变形 |
invent 创造 | invention 创造物 inventor 创造家 |
amaze 使惊奇 | amazed 感到惊奇的 amazing 让人惊奇的 |
calculate 计算 | calculation 计算 calculating 计算的 calculator 计算器 |
electron 电子 | electronic 电子的 electric 带电有关的 electrical 与电有关的 electricity 电 |
live 生活 | living 活的 alive 活着的 lively 活泼的 |
instruct 指示 | instruction 指示 |
develop 进步 | developing 进步中的 developed发达的 development 进步 |
near 接近 | nearly 差不多 |
power 力 | powerful 强大的 |
Greece 希腊 | Greek 希腊人，希腊语/ 希腊的 |
nation 国家 | national 国内的 international 国际的 nationality 国籍 |
especial 特别的 | especially 特别，特别 |
light 光 | lightning 闪电 |
life 生命 | lifetime 一生 |
program 编程 | programme 节目 |
solve 解决 | solution 解答 |
随堂小测练：
1.The first steam engine by James Watt was one of the greatest _______________ in the world.
2.The electric light is a great _______________ by Thomas Edison.
3.Who _______________ the 1 to 9 system of numbers?
4.We find some _______________ stories in this book.
5.He was _______________ to hear the news.
6.Let me _______________ the cosplayt of the journey.
7.With the help of a computer , we can do _______________ much faster.
8.A computer is the _______________ machine.
9.We use _______________ to calculate.
10.Students are not allowed to use _______________ calculators in class.
11.Scientists from all around the world want to know why all _______________ things died at the end of the Cretaceous period（白垩纪）.
12.You are lucky to be _______________ after the accident.
13.Before the computer could begin calculating , someone had to program it with ____________ .
14.With the _______________ of economy , China is becoming stronger and stronger.
15.China is a _______________ country and USA is a _______________ country.
16.Although my grandfather is _______________ 90 years old , he is still quiet healthy.
17.The sports car has a very _______________ engine.
18.Knowledge is _______________ .
19.In ancient times, people in _______________ were good at planting crops.
20.As we all know, Tokyo is an _______________ city.
21.The car is quite small, _______________ if you have many kids.
22.We are afraid of _______________ and thunder.
23.It took him the whole _______________ to buy the house.
24.Someone had to first _______________ the computer with instructions.
25.Use your brain, and try your best to _______________ the problem yourself.
同义句转换:
【U4同义句转换】
1. in the past = in ancient times
In the past, many people wear silk clothes.
= In ____________ ____________, many people wear silk clothes.
2. nobody = no one
Nobody has been to the West Lake. = ____________ ____________ has been to the West Lake.
3. so + adj. + that + 句子（一定）= adj. + enough to do sth.
Her brain is so powerful that she can work it out in such a short time.
= Her brain is ____________ ____________ to work it out in such a short time.
Abacuses are so accurate that the people still use them today.
= Abacuses are ____________ ____________ for people to use them today.
4. add…and… divided by…is / equals…
Divide 36 by 4, the answer is 9. = 36 ____________ by 4 ____________ 9.
Four and three is seven. = If you ____________ four and three, you get ____________.
5. sb. spend __________ doing sth./on sth. = It takes sb. __________ to do sth.
Jim took three seconds to find the answer.
= ____________ ____________ Jim three seconds to find the answer.
I spent 3 hours making a birthday cake for my dad.
= It ____________ me 3 hours ____________ make a birthday cake for my dad..
6. too adj. for sb. to do sth. = so adj that + 句子（否定）= not adj.（反义）enough for sb.to do
The problem is so difficult that all the students can’t work it out.
= The problem is ____________ difficult ____________ all the students work out.
The old man is so weak that he couldn’t walk by himself.
= The old man is ____________ weak ____________ walk by himself.
= The old man is ____________ ____________ enough to walk by himself.
7….or you will do …=If you don’t do…, you will…
Hurry up, or you’ll miss the train.
= If you ____________ hurry up, you ____________ miss the train.
8. solve= work out
I will help you solve the problem. = I will help you ____________ ____________ the problem.
9. almost = nearly
The job is almost finished. = The job is ______________ finished.
10. in a short time = in a flash
Mum will be back in a short time. = Mum will be back ____________ ____________ ____________.
11. correct = accurate
He gave correct answers to the questions. = He gave ____________ answers to the questions.
12. not forget = remember turn off = not turn on （反义转换）
Don’t forget to turn off the lights before you leave.
= ____________ to turn off the lights before ____________.
Please turn off the radio. =Please ____________ turn ____________ the radio.
13. not anything=nothing
He didn’t say anything at the meeting. = He ____________ ____________ at the meeting.
14. no one else = nobody else
Paul sings the best in our class. = ____________ ____________ in our class sings as well as Paul does.
= ____________ ____________ ____________ in our class sings as well as Paul does.
15. represent = stand for
The heart represents love. = The heart ____________ ____________ love.
16. joined + 过去时间点ago = has / have been in …+for 时间段
He joined the army five years ago.
= He ____________ ____________ ____________ the army for five years.
17….not… …not…,either = neither…nor…+ v.（单数形式）
Li Hua doesn’t like swimming. Wang Hai doesn’t like swimming, either.
= ____________ Li Hua ____________ Wang Hai ____________ swimming.
要紧语法
1.基数词变序数词
基变序，比较容易，1,2,3，特殊记，结尾字母t,d,d,
8少t，9去e, ve要用f替。
几十几只变个位就能，
整十变序也容易，y变ie就能。
末尾th别忘记。
注意：four—fourteen—forty—forty-two nine—nineteen—ninety—ninety-nine
fourth—fourteenth—fortieth—forty-second ninth—nineteenth—ninetieth—ninety-ninth
2.几种特殊数词表达法：
（一）普通分数： 子基母序，分子>1，分母+S
1/3: one third 2/3: two thirds
1/2:读作 a half或one half
1/4读作 a quarter 或one fourth
（二）百分比：基数词 + percent
2%读作 two percent 27%读作 twenty-seven percent
（三）习惯表达：
one and a half apples= one apple and a half 一个半苹果
half an apple半个苹果 one or two apples= one apple or two 一两个苹果
10:30 half past ten
10:25 twenty–five past ten
9:45 fifteen to ten 或 a quarter to ten
3.加减乘除---数字的运算
（一）入门知识：=: is/ equals +: plus -:minus *: multiplied by /: divided by 都是介词。
加法：3 plus 9 is/equals 12. 减法：9 minus 3 is/equals 6.
乘法：3 multiplied by 9 is/equals27. 除法：9 divided by 3 is/equals 3.
（二）句型：一般用“加减乘除”的动词原形来开头，构成祈使句，命令做题者。
Add A and B Subtract A from B
Multiply A by B Divide A by B
If we add 2 to 5, we can get 7. Multiply 2 by 3, please.
4.读数：
1000以上数，用计数符号，每三位加以逗号，从第一个逗号起单位依次为thousand, million, billion.“万”表达为ten thousand
例：579 five hundred and seventy-nine
802 eight hundred and two
4, 352 four thousand three hundred and fifty-two
14, 615 fourteen thousand six hundred and fifteen
123, 456, 789
one hundred and twenty-three four hundred and fifty-six thousand seven hundred and eighty-nine
5.常考易错点：
确数与概数的表达：
确数：基数词+单位+复数名词： two hundred students 200名学生
概数：单位加S +of+复数名词：thousands of visitors 成千上万的游客
in + 物主代词 + 数词的复数形式，表示某人的年龄。
in one’s thirties 在某人三十多岁的时候
