B3U4P3
Book3 Unit4 Period3
编写：孙东夷3/15/2015
学习目标：A/B 1熟记和使用本节六个词组；2能拓展所列相关短语 3.做题应用
C 1.熟记和使用本节六个词组；2.尽量能拓展所列相关短语 3.选择做题
D. 1.熟记和使用本节六个词组 2.选择做题
自主合作探究：
6．exist vi.存在；生存
They laid eggs too and existed on the earth for more than 140 million years.(P26)
它们也生蛋，在地球上生存了一亿四千多万年。
归纳拓展
①exist in存在于exist on靠……生存There exist(s)/existed...某地有/存在……
②existence n．存在；生存
come into existence开始存在；成立in existence现存的；现有的
①He exists on selling fruits. 译：
②There exists a tall tree in front of my home. 译：
即时应用用exist的适当形式填空
①He doesn't believe in the________of ghosts.
②Did huge animals________on the earth a long time ago?
7．give birth to产生；分娩
...because they gave birth to young baby animals and produced milk to feed them.(P26)
译：
归纳拓展at birth出生时by birth天生地；生来；在血统上
a second birth新生，再生
①Babies look the same at birth. 译：
②I'm a Chinese by birth. 译：
即时应用用birth的短语填空
①他说的话引起了一场争吵。What he said____________a quarrel.
②据说杰克逊生来就是黑人。Jackson was said to be a black man____________.
8．in one's turn轮到某人；接着
Thus they have，in their turn，become the most important animals on the planet.(P26)
它们的时代到来了，它们成了这个行星上最重要的动物。
When it was in my turn，I was too excited to speak. 译：
归纳拓展in turn依次；轮流；因此；因而by turns轮流；依次
take turns to do sth./in doing sth.轮流做某事
It is sb.'s turn to do sth.轮到某人做某事
The girls called out their names in turn. 译：
即时应用介词填空
①They should take turns________looking after their old mother.
②The new couple of lovers did housework________turns.
9．prevent...from...阻止，制止
They are putting too much carbon dioxide into the atmosphere，which prevents heat from escaping from the earth into space.(P26)他们把过多的二氧化碳释放到大气层中，这使得地球上的热不能释放到太空中去。
归纳拓展prevent +宾语+from doing
stop +宾语+from doing 阻止......干某事
keep+宾语+from doing
protect...from(against)．..保护……不受……侵袭(from后接能带来伤害或损害之物)
即时应用单句改错
①Nothing could prevent him to go out even though it's bad weather._____________________
②The plan can be prevented being carried out. ___________________________________
③他们没有阻止他发表自己的观点。译：______________________________________ 10．So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.(P26)
所以，在未来的数百万年中，生命能否在地球上延续取决于这个问题能否得到解决。
此句为主从复合句。句中两个whether分别引导了两个名词性从句，分别在句中作主语及介词on的宾语。
It remains to be seen whether or not this idea can be put into practice.(whether引导) 这一想法能否付诸实践还有待于观察。
I'll see whether she's at home.(whether引导)译：
思考：if 与whether 的用法（什么时候只用whether不用if ）
即时应用完成句子
①他喜不喜欢并没有什么关系。It matters little________________.
②我想知道他会不会同意。I want to know________________.
11．puzzle n．谜；难题vi.& vt.(使)迷惑；(使)为难
How life began on earth is one of the biggest puzzles that scientists found hard to solve.(P27) 译：
归纳拓展①be in a puzzle感到困惑；不知如何是好②puzzle about/over冥思苦想；
③puzzling adj.令人迷惑的④puzzled adj.感到迷惑的
be puzzled about对……迷惑不解
即时应用完成句子
①对于未来的计划我很迷惑。________________my future plan.
②这是最令人迷惑的问题之一。This is ________________problems.
达标练习：
I.按要求完成句子
1.Nobody knows when the earth (形成)
2.我们轮流做家务。
3.They were stopped/prevented from entering the burning building.译：。
4.她拿不定主意是该留下来还是离开。She was uncertain________________.
II．用所学的单词短语编句子