Loading... Please wait...5.Small clever animals,now with hands and feet,appeared and spread all over the earth.
一些小巧聪明，长着手脚的动物出现了，它们散布在地球各个地方。
要点提示:
spread(spread,spread) vt.使伸展，延伸vi.（消息等）传开，流行
典型例句:
Mum spread a new cloth bought in the supermarket on the table when we had dinner.
我们吃饭时妈妈在桌子上铺上一条从超市买来的新桌布。
He spread out his arms to welcome us warmly.
他张开双臂热情地欢迎我们。
The exciting news spread through the school quickly.
这激动人心的消息很快传遍了学校。
相关链接:
spread out 传开
spread rumors 散布谣言
spread like wildfire 像野火一般传开
spread oneself 舒展身体
spread the table 铺桌子
spread the load 分摊(工作量)
阅读
阅读时文，体会spread含义
(1)Foot and mouth disease(口蹄疫) spread is a fast spreading disease.
Now it has begun its killing on the whole British countryside,forcing the closure of almost everything ―from country visits to sports events,with all preparing for the worst.
(2)Fear had spread the nation,indeed the whole world.An unknown deadly virus had infected thousands quickly.There was no cure and the number of cases was rising every day.In the media,SARS seemed to be the topic of every headline.In Beijing,the streets were empty.Few had to go outside with masks covering their mouths.
答案：略
6.They are putting too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.
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
要点提示:
prevent sb./sth.(from) doing sth.阻止某人或者某事做某事
典型例句:
His words can’t prevent us from buying books.
他的话不会阻止我们买书。
The heavy rain prevented us going on,but we didn’t lose heart.
大雨阻止我们前进，但是我们不灰心丧气。
相关链接:
另外，与这种结构相似的有stop sb./sth.(from) doing sth.（from可以省略） 和keep sb./sth.from doing sth.（from不可以省略）。
Lynn’s parents tried to stop her seeing him.
林恩的父母企图阻止她和他见面。
You won’t keep the things from happening.
你不能阻止事情发生。
英泽汉
(1)Nothing would prevent him from speaking out against injustice.
______________________________________________________
答案：什么也不能阻止他鸣不平。
(2)Please have an apple to keep you going until dinner time.
______________________________________________________
答案：吃个苹果就能挨到吃晚饭了。
单项选择
（3）The heavy rain _____ us visiting the attractive lake,but we didn’t _____.
A.prevented;lose the heart
B.prevented;lose heart
C.kept;lose the heart
D.kept;lose the heart
解析:第一分句的意思是:大雨使得我们不能参观那湖水，可以用prevented /kept sb. from doing sth.，第二分句意思是:我们并没有灰心丧气，用lose heart表达。选 B项。
答案:B
7.Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.
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。
要点提示:
depend on/upon意思为“依靠，依赖”，常用结构是 depend on sb./ sth.，depend on sb. to do sth.。
典型例句:
The country depends heavily on its tourist trade.
这个国家主要依靠旅游业。
The poor man depends his son to earn money.
这个穷人依靠他的儿子去赚钱。
相关链接:
要特别注意depend on it常用于句首或句末，意思为“请放心，没问题”;It all depends和That depends意思为“看情况而定”，二者都用于口语中。例如：
Depend on it,he’ll turn up.
请放心，他一定会来的。
It depends how you tackle the problem.
那取决于你如何解决这个问题。
完成句子
(1)—Is your father coming tomorrow?
— _______ _______ (那要看情况).He may not have the time.
(2)—We don’t know if we can offer help.
—_______ _______ _______ (一切看情况而定).
(3)—What is your attitude?
—_______ _______ _______ (请放心).We won’t give up.
答案：
(1)That depends (2)It all depends(3)Depend on it
脑筋急转弯
(1)Why is the library the highest building?
(2)Why is the river very rich?
(3)What is the longest word in the world?
答案：
(1)It has the most stories.（故事，楼层）
(2)It has two banks.（岸，银行）
(3)smiles（首尾字母相隔一英里）
8.They exist everywhere on the earth.
他们存在于地球上各个地方。
要点提示:
exist v.存在;there exist表示“存在/有”，此时exist不用进行时。
典型例句:
Several people believe the Devil exists in the world.
少数人认为世界上存在恶魔。
There exists warmhearted person everywhere.
好人到处都有。
Conference like the Earth Summit help people understand that there exist serious problems and that there is still time to take action.
像地球峰会一样的会议有助于人们明白现存在的严重问题，也明白还有时间来采取行动的。
相关链接:
there exist表示“存在/有”，是 “there be”句型的延伸，类似的还有:
there stand,there lie,there live,there occur。
改错
(1)It is surprising that a kind of animal is existing in the dry desert.
(2)There exist a good way to solve many difficult physics problems.
答案：
(1)is existing→exists
(2)exist→exists
幽默
Son:Daddy,I think I must go to see the doctor.My teacher says there is something wrong with my ears.
Dad:What is the matter?
Son:Things always go into my left ear and out of my right ear in class.
9.Before we left,Li Yanping explained to me that the force of gravity would change three times on our journey...
我们起飞前，李彦平向我解释说，在我们的航行中会有三次重力的改变，……
要点提示:
force n.力，力量;（forces pl.）军队;暴力，武力
典型例句:
The force of the explosion broke all the windows in the building.
那爆炸将该建筑物的玻璃全部震碎。
No man would use force on another in a truly civilized society.
在真正的文明社会中，不会有人对他人实施暴力。
相关链接:
by force of 依据，凭借……之力
come into force（法律）实施
labor force 劳动力
the air force空军