Unit3 Electricity 第1课时 基础知识及拓展 课件(共32张PPT)

(共32张PPT)
Lead in— 脑筋急转弯
Q: 能否用树叶遮住天空？
A：只要用树叶盖住眼睛
沪教版 英语 八年级 第二学期
Snow and Ice Knowledge 冰雪知识
Bobsleigh
雪车
沪教版 英语 八年级 第二学期
Unit3
Electricity
Electricity
W____
E_________
orks
verywhere
一、新课单词讲解
1. servant n. 仆人；佣人
e. g. Fire and water may be good servants, but bad masters.
[谚]水火是忠仆，用之不慎成灾主。
A politician should be a servant of the people.
政治家应当是人民的公仆。
【知识拓展】 serve v. 服务，待客
e.g. They served the guests a wonderful dinner.
他们以盛宴招待客人们。
service n. 服务
e. g. The train service to the capital is very good.
开往首都的火车服务设施非常好。
2. trick v. 欺骗；坑人
e. g. Her tricked me into giving him the money. 他哄骗我给了他钱。
（常与out of连用）骗走，恶作剧
e.g. His partner tried to trick him out of his share. 他的合伙人企图骗走他的股份。
【知识拓展】 trick n. 诡计；骗术，花招
e. g. I can do magic tricks. 我会变魔术。
The children played a trick on their teacher. 孩子们捉弄了他们的老师。
3. electricity n. 电
e.g. The power station supplies electricity to this area. 这个电站供应这个区域的电。
【知识拓展】 electrician n. 电工 electric adj. 发电的，由电产生的
e.g. an electric cenerator发电机 an electric plug电源插头 an electric iron电熨斗
4. flow v. 流动
e.g. The cars flowed in a steady stream along the main road.
汽车在主干道上不停地驶过。
【常用搭配】
flow away流走；流逝 flow down流下 flow into流入
e.g. Time flows away quickly. 时光飞逝。
Waterfall flows down to the bottom of the hill.
瀑布飞流直下到山脚下。
Rivers flow into the sea. 江河流入海中。
5. meter n. 仪表；计量表
【常用搭配】
a gas meter煤气表 an electricity meter电表
a speed meter速度表
e.g. There's a gas meter in every home.
在每间屋里都有煤气表。
6. amount n. 数量；量
e.g. No amount of washing will remove them. 怎么洗也洗不掉。
What is the amount of this 这总共是多少？
7. monthly adv. 每月一次
e.g. A monthly paper is printed every month. We read it monthly. 月刊是每月印刷的，我们按月读它。
We pay the telephone bill monthly. 我们每月付一次电话账单。
【知识拓展】 daily adv. 每天一次，每天地
weekly adv. 每周一次，每周地 yearly adv. 每年一次，每年地
8. explanation n. 解释；解说；说明
e.g. The only explanation for his behaviour is that he's mad. 对他的行为的唯一解释就是他疯了。
【知识拓展】 explain v. 解释；说明
e.g. Can you explain why you were late 你能解释一下你为什么迟到吗？
9. scratch v. 搔；挠
e.g. He scratched the insect bite on his leg with his nails.
他用指甲挠他腿上虫咬的地方。
（常与out，off，through连用）刮掉，削去；擦去：删掉；划掉
e.g. Her name had been scratched out of the list.
她的名字已从名单上划掉了。
Could you help me scratch the rust off the wheel
你能帮我把轮子上的锈刮掉吗？
10. invisible adj. 看不见的；无形的
e.g. Air is invisrble, but we can feel it when it moves.
空气是看不见的，但是当它移动的时候我们能感受到。
【知识拓展】
visible adj. 看得见的；明显的；显著的 vision n. 视力
e.g. Air isn't a visible object. 空气不是可见物体。
She has good vision. 她的视力很好。
11. form n. 形状；形式
e.g. He seems to dislike any form of exercise.
他好像讨厌任何方式的运动。
【知识拓展】 form n. 方式；制度
e.g. Different countries have different forms of government.
不同的国家有不同的政治制度。
l2. energy n. 能量
e.g. Young people usually have more energy than the old.
年轻人通常比老年人有活力。
Each year Americans use a high percentage of the world's energy. 每年美国人消耗掉世界能源的比例很高。
【知识拓展】 energetic adj. 精力充沛的
e.g. He is an energetic child.他是个精力旺盛的孩子。
13. bulb n. 电灯泡
e.g. The bulb is broken. Please change another one. 这个灯泡坏了，请再换一个。
14. connect v. 连接，联合
e.g. Will you connect this wire to the television
你把这根电线和电视机连上好吗？
This thick wire is connected to my computer.
这根粗电线连接到我的电脑上。
This flight connects with a flight for New York.
这个航班可接上飞往纽约的一班飞机。
【常用搭配】 connect with和……有联系，和……有关
e.g. People connect Vienna with waltzes and coffee-houses.
人们一提到维也纳就会联想到华尔兹圆舞曲和咖啡馆。
15. bury v. 埋葬，掩埋
e.g. The house was half buried under snow. 房子一半埋在雪中。
Many men were buried underground when there was an accident at the mine.
矿上发生意外事故时，许多矿工都被埋在地下。
He buried himself in his work. 他埋头工作。
16. politely adv. 客气地，斯文地
e.g. You should serve our guests pohiely.
你必须有礼貌地服务我们的客人。
Tom offered me a cigarette. I refused politely.
汤姆给我一支烟，我礼貌地拒绝了。
【知识拓展】 polite adj. 有礼貌的；斯文的 politeness n. 有礼，优雅
e.g. It wasn't very polite of you to serve yourself without asking. 你也不问一声就自己吃起来是不太礼貌的。
17. grin v. 露齿笑，咧嘴笑
e.g. There was a grin on his face when he opened his birthday presents.
当他打开他的生日礼物时，他的脸上露齿一笑。
【知识拓展】 grin vt. 咧嘴而笑
e. g. He was grinning with delight. 他高兴得咧开嘴笑。
18. battery n. 电池
e. g. Our bus won't start because the battery is flat.
我们的大客车发动不起来了，因为电池坏了。
This pocket calculator needs two batteries.
这个袖珍计算器需用两节干电池。
19. contain v. 包含，含有
e. g. Pig iron may contarn 4%of carbon.
生铁可含百分之四的碳。
The bottle contains two pints. 这瓶装两品脱。
指点迷津：contain, hold
两个单词都含“包含，容纳”的意思。contain着重“其中确实包含有”。
e. g. The bottle contains water.这个瓶子里有水。hold指“能容纳”。
e. g. The house holds 20 people. 这房子能住下20人。
Daily expressions. 日常表达
1. be careful with谨慎，小心
e. g. Be careful with those delicate plates.
使用那些细巧的盘子要小心。
Be careful when you're crossing the road.
过马路时要当心。
2. change into 变为；使改变
e.g. The next morning, the water had changed into ice. 第二天早晨，水变成了冰。
We can change electricity into different forms of energy such as light energy.
我们能把电变成各种形式的能量，比如光能。
The witch tried to change iron into gold.
那位巫婆试图把铁变成金。
3. think of思考，想出来
e.g. Have you thought of what job you are going to do 你考虑过准备做什么工作了吗？
We are thinking of going to France.
我们正考虑到法国去。
I can’t think of his name at the moment.
我一时想不起他的名字。
4. be connected to被连接到
e.g. Are these cables connected to the power station 这些电缆是连接到发电站的吗？
The channel will connect Britain to Europe for the first time in history.
这条隧道将有史以来第一次把英国和欧洲大陆连接起来。
5. at last最后
e.g. He waited for the bus for an hour. At last, it arrived.
他等了一个小时的公交车，最后终于来了。
I . Fill in the blanks with the given words in their proper forms.
1. Would you like to get me some (battery)
2. Don't always do such (fool) things, boy!
3. Modern Family is a popular (month) magazine.
4. In our daily life, electricity is a good (serve), but a dangerous one.
5. The weather in Shanghai is always (change) in spring.
【随堂小练】
【keys】
I. 1. batteries 2. foolish 3. monthly 4. servant 5. changeable
II. Choose the right word to complete the sentence.
1. I usually get the bill (to / for) water at the end of the month.
2. The book is too difficult for a child to understand (in / by) a way.
3. Please be careful (to / with) your steps on the rainy days.
4. Do you know the keyboard is connected (to / with) the computer
5. We can buy rice and flour (in / of) packets.
II. 1. for 2. in 3. with 4. to 5. in
愿君皆有所获，皆有所得