Unit 5. A Lesson in a Lab
一．重点词汇及拓展
1.contract vi.& n．收缩；(订)合约
2．float vi.漂浮
3．expand vi.膨胀→expansion n．膨胀
4．mixture n．混合物→mix v．混合
5．electricity n．电→electrical adj.电的，和电有关的→electric adj.发电的，用电的
6．reaction n．反应→react vi.反应
7.equipment n．设备，装备→equip vt.装置
8．astonished adj.吃惊的；惊愕的→astonishing adj.令人吃惊的→astonish vt.惊讶，吃惊→astonishment n．惊讶，惊奇
9．react to后面接什么aim n．& v．目标；以……为目标→aimless adj.漫无目的的
10．balance n．天平；平衡→balanced adj.平衡的
二．重点短语
1.react with与……反应
2．add ...to往……加入
3．used  to过去常常
4．be proud of因……而自豪
5.be supposed to理应；应该
6．in order 使……整齐；使……有条理
7．keep ... out of 防止……进入；不让……靠近……
三．重点句型  
1.It is hard to think of a world without metals.很难想象一个没有金属的世界。
2．Here is a table with the metals that react most at the top，and the metals that react least at the bottom.
这儿有一个图表，那些反应最强烈的金属在上部，反应最不强烈的在下部。
3．The closer you are，the more you'll see.你靠得越近，你看到的就越多。
四．语法
Degrees of comparison(比较等级)
一．重点词汇及拓展
1．exist vi.存在；生存(无被动式和进行时)
归纳拓展
(1)There 某地有……；存在……
exist in在于……
exist on＝live on靠……生活/生存
(2)existence n．存在；生存
be in existence存在
come into existence开始产生，成立
bring into existence使产生
(3)existent adj.存在的；现行的
例句：We can't exist without food or water.
I can hardly ____________ the wage that I'm getting.我靠我挣的工资简直难以糊口。
When did the world _______________________?世界是什么时候开始存在的？
【链接训练】
①He doesn't believe in the ________ of God.
A．life                  B．exist
C．existence              D．exhibition
②As everyone knows，since the Communist Party of China ________ in 1921，great changes have taken place in China.
A．came into effect          B．came into exist
C．came into existence      D．came into power
2．conclusion n．结论，决定；结束，结局；协定，协议
(1)come to/arrive at/reach/draw a conclusion得出结论
make a conclusion下结论
a conclusion使……结束
in conclusion总而言之；最后
(2)conclude v．结束，断定，推断出
例句：I've ____________________ that he's not the right person for the job.
我断定他不适合做这项工作。
_____________, I would like to thank you for your coming to the meeting.
最后，我对各位出席这次会议表示感谢。
After waiting for half an hour, I concluded that he wouldn't come at all.
【链接训练】
The ________，I think，he drew from his simple experiment is not scientific.
A．conclusion　B．charge　C．promise　D．relation
3．aim n．[C]目标，目的；[U]瞄准　vt.瞄准，对准，目标在于
归纳拓展
(1)take aim at瞄准，对准
achieve/attain one's aim达到目的
miss one's aim打不中目标/达不到目的
without aim漫无目的地
(2)aim at瞄准，对准；目的在于
aim gun at把瞄准……
aim to do sth.旨在做某事
be aimed at针对；目的是，旨在 
(3)aimless adj.无目的的；无目标的；
aimlessly adv.无目的地；无目标地
例句：Teamwork is required in order to achieve these aims.
He aimed the gun at the bird.
My sister aims to be a pilot when she leaves school.
【链接训练】
The farmer built long fences，________keeping the wild dogs out of them.
A．aim at　B．aim for　C．aiming at　D．aiming for
4．form n．表格；形式；外形；状态，精神　vt. & vi.形成；构成；组织；养成；培养
(1)fill in/out the form填表
be in/out of form状态良好/不好
in the 用……的形式
take the 采取……的形式
(2)form a good habit of形成一种……的好习惯
form in line排好队
form (＝set up) a company创办公司
form into组成……；编成……
例句：He is filling in the application form.
The team were _________________ throughout the whole competition.
这个队在整个比赛过程中一直处于良好的状态。
The cookies were all _______________________stars.
那些饼干的形状像星星。
They ____________________________ when in high school.
【链接训练】
________，the house is like the letter S.
A．In form              B．In the form
C．With form              D．In a form
5．balance n．天平，秤；平衡；收支差额，余额
v．平衡；斟酌，权衡
(1)keep a balance between A and B 保持A与B均衡
keep one's balance保持(身体)平衡；保持镇静
lose one's balance失去平衡，心慌意乱(表动作)
be out of balance失去平衡(表状态)
in/on balance总的来说，权衡起来，两相比较
(2)balance A against B 权衡/比较A与B
(3)balanced adj. 保持平衡的；均衡的
例句：Can you balance yourself on skates?
You should balance the advantages against the disadvantages before your final decision.
His suggestion has，on balance，proved useful.
他的建议总的来说是有用的。
【链接训练】
There are both advantages and disadvantages in the scheme proposed，but ________ I think we should benefit by adopting it.
A．on balance          B．out of balance
C．on the balance          D．off balance
二．重点短语
1．往……加入……；把……加到/进……里
add up sth. ＝add sth. up 把……加起来
add up to总共是；总计为(不用于被动语态)
补充道……
add in算入；包括
add to增加；加到
例句：Add some oil to the water.往水中加入一些油。
______________________ and we will see who win.
The continuous rain _____________our difficulty in rebuilding the dam.

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