习惯用语：buy sth.for…= spend … on sth.
5. flow(into, through, etc.sth.) v. 流；流动
6. explanation n.解释；说明
explain v. 解释
7. invisible adj. 看不见的，不可见的
反义词：visible adj. 看得见的
vision n. 视力；视野
have good / normal vision 视力好 / 正常
8. energy n. 能量；能
heat energy热能 light energy光能
9. connect v. （使）连接；联结
习惯用语：connect A to / with B
connect Aand B10. bury(buried, buried)v. 把（某物）掩藏在地下
习惯用语：bury one’s nose in a book 埋头看书
11. power n.（1）电力供应 apower station 发电厂；发电站 （2）能力
powerlessadj. 无能为力的 bepowerless to do sth.
powerful adj.强有力的 powerfulweapons 强大的武器
12. contain v. 包含；含有；容纳
container n. 容器
13. chemical （1）n. 化学物质 （2）adj. 化学的
chemical changes 化学变化
chemistry n. 化学
chemist n. 化学家；药剂师
14. produce v. 生产
product n.产品 meat products 肉制品
production n. 生产；产量
二、句式
1. Although electricity is much more dangerous than water, …
尽管电比水要危险得多，……
（1）although conj. = though 虽然；尽管
（2）much more dangerous than …
much用来修饰比较级可以修饰比较级的词much, a lot, far, ……得多 a little, a bit, ……一点儿even 甚至， still 仍然
2. Can you tell me what it looks like? 你能告诉我它看起来像什么吗？
3. We call the thick wires cables. 我们把粗电线叫做电缆。
4. We can change it into forms of energy that we can see, hearor feel.
That we can see, hear or feel 是定语从句，修饰energy。that为关系代词，在定语从句中做宾语。
三、语法
May I / we… ？这一类疑问句的肯定回答为 Yes,please. 或 Certainly;
否定回答为 Please don’t. 或 No, you mustn’t.随堂反馈
I.Choose the best answers:( )1. John, look at the time. _______ you playthe piano at such a late hour?
A.MustCanMay D. Need( )2. There ______be any difficulty aboutpassing the road test since you have practiced a lot in the drivingschool.
A. mustn’tmustC. shouldn’tD. needn’t
( )3. Excuse me. ______ you please pass methat cup?
A.DoShouldWould D. Must( )4. We forgot to bring our tickets, butplease let us enter, ______?
A. doyouB. canweC. will you D. shall we( )5. Black holes ______ not be seendirectly.
canshouldmust D. need( )6. —Must he come to sign this paperhimself?
—Yes, he ______.
A.needmustmay D. will
( )7. The World Wide Web is sometimes jokinglycalled the World Wide Wait because it ______ be very slow.
shouldmustC. willD. can( )8. —Why don’t you ask Mike to go withus?
—Thanks, ________.willwon’tcan D. I may( )9. —I think I’ll give Bob a ring.
—You ________. You haven’t been in touch with him for ages.willmaycan D. should( )10. —Could I have a word with you, mum?
—Oh dear, if you ________.canmustmay D. should( )11. The poor man needs our help, ________he?
A. needneedn’tdoes D. doesn’t( )12. —The winner of the race is a tall andthin boy with thick glasses.
—Then it _______ be my friend Mike. He is not good atrunning.
A.mustn’tcan’tmight D. shouldII.Rewrite the sentences as required:
1. My father bought me a new bicycle. （改为被动语态）
A new bicycle _________ _________ for me by my father.
2. Everything goes well.（改为反意疑问句）
Everything goes well, ________ ________?
3. They are running fast. （改为感叹句）
_________ _________ they are running!
4. She became ill because it was too cold. （改为简单句）
She became ill _________ _________ the coldweather.
5. He asked the girl:‘Why do you live in thecountry?’（改为间接引语）
He asked the girl _________ she _________ inthe country.
III. Complete the sentences with the given words in their properforms:
1.I could not find my little brother because he was _________ in thebig crowd. (vision)2.He is good at all the subject except _________. (chemical)3.It is common knowledge that tigers are _________ to people.(danger)4.Phelps won eight gold medals at the Beijing Olympics, so he is_________ known in the world. (wide)5.You can find the books you want to borrow easily with the help ofthe _________. (library)IV. Complete the sentences with the given words in their properforms:
1.They _________ (be) friends since they were boys.2.Tom often _________ (go) to the school library to borrow books.3.By the end of last term, we _________ (learn) more than onethousand English words.4.Please _________ (not make) any noise. We are having a meeting.5.I am very sorry. I really _________ (not know) you were having atalk here.6.The boy is used to _________ (get) up early now.本文链接： http://2chemiche.immuno-online.com/view-707470.html
