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1、 Unit 4 Global Warming学案2重点、难点及考点解析一、重点单词1compare1vt. 比较；对照。如： Compare your answers with those at the back of the book to see if they are right. 把你的答案同书后面的答案对照一下，看看是否正确。 My handwriting can not be compared with my fathers. 我的书法不能与我父亲的相比。 2vt. 喻为；比拟。如： Mans life is often compared do a candle.人生常被比为蜡烛。
2、 Shakespeare compared the world to a stage.莎士比亚把人世比做舞台。 comparewith表示“把与相比（同类相比）” compareto 表示“把比做（异类相比，比喻）” compared to /with 与相比, 只能作状语2amount n. 数量 习惯用语：an amount of 相当数量的; 一些 修饰不可数名词amounts of 相当数量的; 一些 修饰不可数名词large amounts of money 大量的金钱3concern v.使担心；使关心；使烦恼 The boys poor performance at school
3、 concerned his parents. 这个男孩在学校很差的表现，使他父母很担心。 注意：其过去分词concerned通常作形容词用，意为“担心的；烦恼的；忧虑的”。 The concerned parents were all concerned for the childrens safety. 忧心忡忡的家长们都为孩子们的安全担忧。 涉及；与有关或相关Attend to what concerns you. 注意与你有关的事物。注意：其过去分词concerned常用来作表语，意为“和有关；牵涉”；而作定语，则意为“有关的”。 It is reported that the pop
4、 singer is concerned with selling drug.据报道，那个流行歌手涉嫌贩毒。 He asked all concerned to take an active part in helping the girl. 他要求所有相关的人积极帮助那个女孩。 、concern作名词 1. 有关的事（可数） Thats my concern, so Ill do as I like about it. 那是我的事，因此，我想怎么做就怎么做。 1 关怀；关心（不可数） Some people dont show much concern for our environment
5、. 有些人不太关心我们的环境。3担心；担忧 She showed great concern about you.她很为你担心。4. rangerange v.排列, 使成行；偏袒，站在的方面。 n. ：范围(尤指从到各种种类,可供选择的范围等，可加不定冠词) ；排列 beyond the range of 超越的范围out of ones range 某人达不到的这家商店商品品种多。The shop keeps a wide range of goods.v.排列, 使成行；偏袒，站在的方面。主要搭配为：+名词/代词；+介词+名词/代词；常可用于: 1. 被动结构 2. range ones
6、elf； 3. range from to / betweenand 从到不等。老师令其学生沿着小径排队。The teacher _along the path.温度在15度到35度之间。The temperature_.我们应当列身于法律与秩序的一边。We should _ on the side of law and order.Keys：ranged his students；ranges from 15 to 35 degrees；range ourselves二、重点短语1 come about come about 发生，造成 相当于happenWhen Mother woke u
7、p, she didnt know what had come about. Ill never understand how it came about that you were late three times a week. Do you know how the air accident came about? 2keep on 继续 +doing sth.他们虽然很累了，还是继续工作。They keep on working although they are tired.3build up逐步建立，增加，增进build up ones fortunebuild up ones s
8、trengthbuild up the businessThis built up my hope after the interview.Sediment (沉淀物)builds up on the ocean floor.4make a difference make a difference(1)有很大差别, 有很大不同(2)有很大的关系/影响make some/ no difference to对.有些/没有关系That makes no difference to me.那对我没有影响。Exercise can make a great difference to your heal
9、th.锻炼对你的健康产生很大的影响。5. put up with put up with 忍受;忍耐;受苦That woman, as a housewife, has a lot to put up with. 作为家庭主妇,那女人得忍受很多烦恼。知识拓展put aside 节省(钱、时间);储蓄;把放在一边 put away 收拾起来;储存(钱);喝掉 put back 放回原处;拖延 put down 写下;记下;控制 put forward 提出(意见、建议);推荐 put off 延期;推迟 put on 假装;增加;上演(戏剧) put out 熄灭;使忧虑;扑灭;出版put up
10、 举起;张开(伞);张贴;为提供食宿 6. so long as / as long asas long as 只要，如果As long as there is life there is hope. 留得生命在,不怕没希望. You can go out, as / so long as you promise to be back before 11 oclock. 你可以出去,只要你答应在11点以前回来. Ill accept any job as / so long as I dont have to get up early. 只要不必早起,任何工作我都可以接受. 在用as / so
11、 long as连接的从句中,当其谓语为be,而主语和主句的主语相同时,则从句的主语和be可以省略。如: Im sure we are safe as long as (we are) in his care. 我深信只要在他的保护下,我们就会平安无事. 三、重点句型1What do you think green house gases do?本句中think后接了一个由what引导的宾语从句。但应注意的是：特殊宾语从句即当一般疑问句主句的谓语动词是 think, believe，suppose，consider, imagine，guess 和 suggest 等时，表疑问的词要放在主句前
12、即句首。例如：正 Who do you think will win in the game?误 Do you think who will win in the game?当然一般情况下宾语从句的疑问词应放在主句之后，例如：误 Why do you know we cant cut down the big tree?正 Do you know why we cant cut down the big tree?2There is no doubt that.一、作不可数名词,作疑惑;怀疑”肯定句中doubt多接whether (一般不用if代替) 同位语从句。如: Theres some
13、doubt whether hell keep his promise. 他会不会信守诺言还难说。 She had her doubts whether the new book would sell well. 她怀疑新书是否会畅销。否定句中doubt多接that同位语从句。如: There is no doubt that they will ask you for help. 毫无疑问,他们会请你帮忙的。 I have no doubt that you will succeed. 我毫不怀疑你会成功的。 二、作及物动词常用于下列句型中,作怀疑;不能肯定;不大相信解,一般不用进行时态。用
14、于否定句或疑问句,后接that引导的宾语从句。如: I dont doubt that he is telling the truth. 我毫不怀疑他在讲真话。 Do you doubt that he will win the match? 你怀疑他会赢这场比赛吗? 用于肯定句,一般接whether 或if引导的宾语从句.如: I doubt whether we will make a profit out of it. 我认为我们不可能从此事中获利。 We doubt if she will be persuaded. 我们不知道她会不会被说服。 3Some byproducts of
15、this process are called “greenhouse” gases, the most important one being carbon dioxide.the most important one being carbon dioxide 是一个独立主格结构，由名词+分词构成，在句中做补充说明或伴随的状况。_(时间允许的话)，I will show you around the city._(今天是星期天)，I dont have to go to work._(没有人要说的话)，the meeting was closed.Keys：Time permitting；T
16、oday being Sunday；Nobody having any more to say4Without the green house effect，the earth would be about thirty-three degrees Celsius cooler than it is.这是一个含蓄虚拟条件句有时假设的情况并不以条件从句形式表示出来，而是通过一个介词短语或其他方式表示。常用的词或短语有：without, but for，but that，otherwise，or，but等。 Without your help ( = If we had not had your
17、help)，we could not have succeeded要是没有你的帮助，我们是不会成功的。 四、 疑难辨析 1result in/ result fromresult in 结果; 致使; 导致主语：起因 in 的宾语：结果Acting before thinking always results in failure.做事不先考虑总会导致失败。The accident resulted in the death of two people.这场意外事故造成两人死亡。result from 起于, 由于, 由引起，主语： 结果 from 的宾语：起因His sickness res
18、ulted in eating too much. (in / from)2take place, happen, occur, come about和break out用法区别 这些词或短语都有“发生”的意思，但用法各不相同，区别如下： (1). take place 表示“发生、举行、举办”，一般指非偶然性事件的“发生”，即这种事件的发生一定有某种原因或事先的安排，例如： Great changes have taken place in our hometown during the past ten years. The Olympic Games of 2008 will take
19、place in Beijing. (2) .happen作“发生、碰巧”解，一般用于偶然或突发性事件，例如： What happened to you? (一般不说：What did you happen?) Maybe something unexpected happened. I happened to see him on my way home. = It happened that I saw him on my way home. (3). occur作“发生、想到、突然想起”解，其意义相当于happen，例如： What has occurred? (=What has ha
20、ppened?) A big earthquake occurred (=happened) in the south of China last month. It occurred to me that she didnt know I had moved into the new house. (4). come about表示“发生、产生”，多指事情已经发生了，但还不知道为什么，常用于疑问句和否定句，例如： When Mother woke up, she didnt know what had come about. Ill never understand how it came
21、about that you were late three times a week. Do you know how the air accident came about? (5). break out意思为“发生、爆发”，常指战争、灾难、疾病或者争吵等事件的发生，也可以表示突然大声叫喊等，例如： Two world wars broke out last century. A fire broke out in the hospital in the mid-night. After the flood, diseases broke out here and there. She broke out, “That is too unfair!”