1、Language pointsUnit 4Useful expressions:according to a widely accepted theory begin with in all directions a cloud of dust settle into a solid globe in time make the earths atmosphere cool down be fundamental to dissolve harmful gases and acids produce a chain reaction fill with all sorts of the age
2、 of dinosaurs remain a mystery be different from all life forms give birth to in ones turn prevent from as a result of live on depend onreligion n.globe n.violent adj.explode v.presence n.harmful adj.exist v.religious adj.global adj.violence n.explosion n.explosive adj.present adj.harm n./v.existenc
3、e n.2.It exploded loudly with fire and rock,which were in time to produce the water vapour2)2)not late 及时；不迟in timein time:1)sooner or later;eventually 迟早；最后；终于all the time 一直;始终at a time 一次，同时at one time 曾经，一度at times 有时候in no time 立即，立刻for the first timecool v.Please open the window to cool the ro
4、om.3.As the earth cooled down,water began to appear on its surface.随着地球的冷却,地球的表面就开始出现了水。cool downa.凉快起来，冷却b.指人的心境“平静下来，使平静下来”A heated argument can be settled better if both sides cool down first.我尽力使她冷静，但是当她离开的时候仍然很生气。I tried to cool her down but she was still very angry when she left.4.Water had al
5、so appeared on other planets like Mars but,unlike the earth,it had disappeared later.unlike prep.不同，不像dislike v.不喜欢likely adj.有可能的Mary和她的姐妹不同，她不喜欢跳舞。因此她很可能会拒绝这次邀请。Unlike her sisters,Mary disliked dancing.So its likely that she would refuse the invitation.be harmful to 对有害do harm to sb.=do sb.harm 伤害
6、某人，对某人有害处1)Pollution is especially harmful to animals.2)吸烟对你有很大的危害。Smoking does you a lot of harm.5.harmful6.They multiplied and filled the first oceans and seas with oxygen.multiply(数目上)增加，增多；乘；（使）繁殖1)Our problems have multiplied since last year.2)2 and 5 multiply to make 10.3)2 multiplied by 5 is
7、10.动词过去式过去分词现在分词意义lie躺，位于lie撒谎lay搁，放，下蛋The naughty boy _ to me that the hen that _ there just now had_ two eggs the day before.A.laid;laid;laid B.laid;lay;lainC.lied;laid;lain D.lied;lay;laidDlaylainlyingliedliedlyinglaidlaidlaying7.They produce young generally by laying eggs.8.in ones turn 轮到某人，接着i
8、n turn 轮流地，依次地take turns to do sth.轮流做某事Its ones turn to do sth.轮到某人做某事9.They are putting too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.阻止某人做某事:prevent sb.(from)doing sth.stop sb.(from)doing sth.keep sb.from doing sth.You should prevent the c
9、hild from injuring himself.1.This is the best way I can think of _ into dangerous areas.A.to prevent people getting B.preventing people getting C.stopped people gettingAUseful sentences 1.What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a sol
10、id globe.它将会变成什么没有人知道，直到38-45亿年前这团尘埃开始慢慢地合成一个固体的球状物。2.The earth became so violent that it was not clear whether the shape would last or not.地球（开始）变得激烈动荡，不知道这个固体形状是否会继续存在下去。3.What is even more important is that as the earth cooled down,water began to appear on its surface.更为重要的是，随着地球的冷却,地球的表面就开始出现了水。
11、4.What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.5.It was not immediately obvious that water was to be fundamental to the development of life.7.Why they suddenly disappeared still remains a mystery.6
12、.This produced a chain reaction,which made it possible for life to begin to develop.8.So whether life will continue on the earth for millions of years to comewill depend on whether this problem can be solved.在未来的千百万年中，生命能否在地球上延续将取决于这个问题能否得到解决。15.Whether life will continue on the earth for millions o
13、f years to come will depend on whether this problem can be solved.for millions of years to come中不定式to come作定语，与前面的名词之间有逻辑上的主谓关系：She is the last person to do such a thing.她是最不像会做这种事的人。it作形式宾语，其真正的宾语可以是不定式，动名词和从句。1.The foreign Minister said,“_ our hope that the two sides will work towards peace.”(2004
14、BJ)2.A.This is B.There is C.That is D.It is 2.I like _ in the autumn when the weather is clear and bright.(NMET2004)A.this B.that C.it D.one 3.Why dont you bring _ to his attention that you are too busy to do it?A.this B.that C.what D.it DCD8.That made it possible for life to begin to develop.4.Why?
15、I have nothing to confess._ you want me to say?A.What is it that B.What it is that C.How is it that D.How it is that 5.Was it at the school _ was named after a hero _ he spent his childhood?A.which;that B.where;where C.that;where D.which;whereAAWord study:Translate the following into English1.把当作2.太
16、阳系3.总有一天；及时4.一般地说来5.信赖；取决于6.目前7.做出选择8.天文学9.氧10.阻止think of assolar systemin timegenerally speakingdepend on at presentmake choices astronomyoxygen prevent from 11.Many millions of years later the first green plants began to appear on land.lateadj.迟到的，晚的；前任的；以前的；已故的later adv.后来，较晚时候,过后 adj.late的比较级(更迟的,更后的)latestadj.最新的latelyadv.=recently 近来1)Mr.Zhu Rongji is the late Prime Minister of China.3)She said she would ring you later this morning.5)Its only lately that she has been well enough to go out.2)He is often late for school.4)Have you heard about the latest news?
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