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北师大版 (2019)选择性必修 第三册Lesson 3 Epidemics Explained教学演示ppt课件
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这是一份北师大版 (2019)选择性必修 第三册Lesson 3 Epidemics Explained教学演示ppt课件，文件包含UNIT9Period5pptx、UNIT9Period5DOC等2份课件配套教学资源，其中PPT共60页， 欢迎下载使用。
1．paragraph n.________________2．crrespnding adj.________________3．differ vi.______________________4．identify vt._________________________
(文章的)段，段落 相应的；对应的 不同，不一样；有异意 确认，发现；认出，识别
1．leave ut_________________________2．break ut_____________________________3．be divided int…__________________________4．avid ding sth.__________________________5．fight against__________________________
省去；遗漏；不考虑 (战争，火灾，疾病等)爆发，发生 被分成…… 避免做某事 抵抗
1．(P62)An epidemic is the rapid spread f an infectius disease ver a shrt perid f time, ________ ________ ________ ________ ________ ________(导致了大量的死亡), the number f which differs fr different diseases. (现在分词作结果状语)【答案】causing a large number f deaths
2．(P63)…use linking wrds ________ ________(必要之处). (省略结构)【答案】where necessary
1．crrespnding adj. 相应的；对应的 (P62)Crrespnding paragraphs【翻译】相应的段落
【语言提升】He has gt bth crrespnding educatin and talents and is equal t this jb. 他既接受过相应的教育又有天赋，可以胜任这份工作。crrespnd vi. 相一致；相符合；通信crrespnd with/t…与……一致/相符/通信Yur accunt f events des nt crrespnd with/t hers. 你对事情的陈述与她说的不相符。
crrespnd with…与……通信I used t crrespnd with my friends by letters while nw the Internet is mre cnvenient. 我过去常写信与我的朋友联络，而现在有了互联网就更方便了。
【针对练习】单句语法填空(1)We shuld try t keep ur actins ________(crrespnd) with ur wrds because nly in this way can we win the trust f thers. (2)The written recrd f his cnversatin didn’t crrespnd ________ what was actually said. 【答案】(1)crrespnding (2)t/with
完成句子(3)Actually, all f us desire t achieve success, but smetimes ur actins dn’t ________ ________ what we desire. 实际上，我们所有人都渴望成功，但是有时候我们的行动与目标并不一致。【答案】(3)crrespnd with
2．leave ut省略；遗漏；忽视 (P62)Cmpare the summary with the riginal text, what infrmatin is included and what is left ut?【翻译】比较摘要和原文，哪些信息被包含了，哪些被遗漏了？
【语言提升】He hadn’t been asked t the party and was feeling very left ut. 他未被邀请参加聚会，感到颇受冷落。On the ther hand, we dn’t want t leave ut any essential detail either. 在另一方面，我们也不想遗漏任何重要的细节。
leave alne不管；别惹；让某人一个人待着I just want t be alne, s leave me alne!我只想一个人待着，所以让我一个人待着吧！leave behind留下；遗留Oh dear! The travelling bag has been left behind. 哎呀！旅行袋忘了拿了。
leave (A)fr B 离开(A)去BIt’s wise t check whether the flight times have changed befre yu leave fr the airprt. 出发去机场之前核实一下航班起飞时间是否有变化，这是明智的做法。leave ver剩下，留下We will leave this pie ver fr tmrrw. 我们把这块馅饼留到明天吃。
【针对练习】完成句子(1)Yu’ve made a mistake—yu ________ ________________ the letter “e”. 你出了一个错, 把字母e 落了。(2)Dn’t ________ any f yur belngings ________. 不要留下你的任何东西。【答案】(1)have left ut (2)leave; behind
(3)They ________ ________ ________ Shanghai tnight as planned. 他们将按计划于今晚动身去上海。(4)I feel annyed right nw. S yu might as well ________ ________ ________. 我正烦着呢。所以你最好别惹我。【答案】(3)will leave fr (4)leave me alne
(5)There were sme chairs ________ ________ when everyne had sat dwn. 大家坐下后，还剩下一些椅子。【答案】(5)left ver
3．differ vi. 不同，不一样；有异议 (P62)An epidemic is the rapid spread f an infectius disease ver a shrt perid f time, causing a large number f deaths, the number f which differs fr different diseases. 【翻译】流行病是指一种传染病在短时间内迅速传播，造成大量死亡，而死亡人数因疾病的不同而不同。
【语言提升】differ frm… 与……不同Human beings differ frm animals in that the frmer is capable f using language. 人类与动物的不同在于前者能够使用语言。differ in… 在……方面不同Peple differ in their attitudes twards failure. 人们对失败持有不同的态度。
different adj. 不同的be different frm…in…在……方面与……不同His public image is very different frm the real persn. 他在公众心目中的形象与他真实的本人截然不同。
difference n. 差异，不同，区别tell the difference between A and B 说出A和B之间的区别Yu can always tell the difference between the turists and the natives. 游客与当地人之间的区别一望即知。
make a difference起作用，有影响I wanted t make a difference in the wrld smehw, but I had n idea hw t d that. 我想以某种方式在世界上有所作为，但我不知道该怎么做。
【针对练习】单句语法填空(1)The tw prducts differ ________ quality and prices. (2)In sme respects, develping cuntries are definitely ________ (differ)frm develped cuntries. 【答案】(1)in (2)different
(3)I vlunteer because I want t nt just see the wrld, but make a ________(different)in it. (4)Jhnsn didn’t seem t be able t tell the difference between right ________ wrng. 【答案】(3)difference (4)and
完成句子(5)Sustainable turism, which ________ ________ ther kinds f turism, will d n harm t ur envirnment. 与其他类型的旅游不同，可持续发展的旅游不会破坏环境。【答案】(5)differs frm
4．break ut (战争、火灾、疾病等)发生，爆发(P62)Sme hundred years later, the Great Flu epidemic brke ut in 1918, als knwn as the Spanish Flu, killing 50 millin peple. 【翻译】几百年后，1918年爆发了大流感，也被称为西班牙流感，造成5000万人死亡。
【语言提升】break ut爆发；突发；掏出；摆脱Where were yu living when war brke ut?战争爆发时你住在哪儿？
Mst f peple had left befre the fire brke ut. 大多数人在火灾发生之前已经离开。She needed t break ut f her daily rutine and d smething exciting. 她需要从日常事务中解脱出来，找点有意思的事做。
break away frm摆脱，脱离，逃离One f the things I lve abut travel is the chance t break away frm daily rutines and frm sme new nes. 旅途中我喜爱的一点就是我有机会可以打破常规生活，形成一些新的生活习惯。
break in打断，插嘴；闯入She lnged t break in n their cnversatin but didn’t want t appear rude. 她很想打断他们的谈话，但又不愿显得粗鲁。break int闯入A burglar tried t break int ur huse last night. 昨晚一个窃贼试图闯入我们的房子。
break up分手；解散A neighbur asked fr the music t be turned dwn and the party brke up. 一位邻居要求调小音乐，聚会便散了。
break dwn出毛病；(身体)垮掉；(精神)崩溃；失败；分解Her health brke dwn under the pressure f wrk. 她因工作压力身体垮掉了。Talks between management and wrkers brke dwn ver the issue f hliday pay. 劳资双方就假日工资的谈判失败了。
【针对练习】完成句子(1)She went thrugh a perid f emtinal adjustment after her marriage ________ ________. 婚姻破裂后，她熬过了一段感情调整期。 【答案】(1)brke up
(2)When the bus ________ ________, she and her husband were able t fix it with a cat hanger and a piece f wd. 当公共汽车抛锚时，她和她的丈夫用一个衣架和一块木头把它修好了。 【答案】(2)brke dwn
(3)They had escaped t America shrtly befre the war ________ ________ in 1939．1939年战争爆发前不久他们逃到了美国。【答案】(3)brke ut
(4)If yu can’t affrd t take a 15-minute ________ ________ ________ yur desk and cmputer screen, take a mini-break by standing up and stretching. 如果你不能挤出15分钟的休息时间来离开办公桌和电脑屏幕，也要稍微休息，站起来，伸展一下筋骨。【答案】(4)break away frm
5．adaptatin n. 适应；改编本 (P62)The 1997 bird flu which claimed ver 100 lives was an adaptatin f the Great Flu f 1918．【翻译】1997年造成100多人死亡的禽流感是1918年大流感的一种改版。
【语言提升】adapt vt. 使适应；改编 vi. 适应adapt (neself)t…使(自己)适应……It tk him a while t adapt himself t his new surrundings. 他过了好一阵子才适应了新环境。
be adapted t…适应……Desert plants are adapted t cping with extreme heat. 沙漠植物适于耐酷热。adapt…fr…把……改编成……Three f her nvels have been adapted fr televisin. 她的长篇小说中有三部已改编成电视节目。
be adapted frm…改变自……Gne With the Wind is an American rmance film adapted frm the nvel f the same name. 《飘》是一部美国浪漫爱情电影，改编自同名小说。adaptable adj. 能适应的Tmrrw’s wrkers will have t be mre adaptable. 未来的工人必须具有更强的适应性。
【温馨提示】adapt (neself)t…与be adapted t…中的t为介词，后跟名词、代词或动名词作宾语。Sn they adapted t living in the cuntryside. 他们很快就适应了在乡下住。
【针对练习】单句语法填空(1)I find it very difficult t adapt myself ________ the climate in the high muntains. (2)D yu think the film ________(adapt)was faithful t the bk?(3)I’m sure she’ll deal with the changes very well; she is very ________(adapt). 【答案】(1)t (2)adaptatin (3)adaptable
完成句子(4)The film ________ ________ ________ ________ a play f the same title. 电影改编自一部同名戏剧。【答案】(4)has been adapted frm
(P63)…use linking wrds where necessary. 【翻译】……必要之处使用连词。【句式剖析】本句中“where necessary”是一种从句的省略形式，补全为“where it is necessary”。
【归纳拓展】当从句的主语和主句的主语一致，且从句中包含be动词时或从句的主语为it is时，可以省略从句的主语和be动词，从而形成“连词＋v. -ing/v. -ed”这个结构。When cmparing different cultures, we ften pay attentin nly t the differences withut nticing the many similarities. 当我们比较不同的文化的时候，我们常常只留意差异而忽视许多相同的地方。
Unless invited, I wn’t attend the party. 除非受到邀请，否则我不参加晚会。Once expsed t light, the film will be damaged and get useless. 一旦暴露在光线下，胶卷就会损坏，变得无用。
【针对练习】单句语法填空(1)Dn’t say anything unless ________(ask). (2)If ________(see)frm the tp f the hill, the city lks mre beautiful. (3)When ________ (buy)a gift fr thers, yu shuld first think f what he r she is fnd f. 【答案】(1)asked (2)seen (3)buying
完成句子(4)________ ________ the patient can then visit his dctr fr further advice. 如果必要的话，病人可向自己的医生咨询以得到更多的建议。 【答案】If necessary
1．argue fr/against赞成/反对2．argue that…主张, 认为3．hld different pinins持有不同的观点4．as far as I’m cncerned在我看来
5．in favr f支持6．play an imprtant part/rle in…在……中起重要的作用7．take measures t d sth. 采取措施做某事8．It is knwn t us that…众所周知……
【引人入胜的开头句】1．Recently a survey has been carried ut n which is mre imprtant in…最近，做了一项关于……更重要的调查。2．Peple have taken/adpted different attitudes twards…人们对……采取了不同的态度。
【精彩纷呈的篇中句】1．Sme peple hld the view that…有些人认为……2．Hwever, thers are ppsed t it, thinking…f mre significance. 然而，另一些人则持反对意见，认为……更重要。
【回味无穷的结尾句】1．Every cin has tw sides. Frm my pint f view, I argue fr the frmer. 事物都有两面性。在我看来，我赞成前者。2．All things cnsidered, we can see that the advantages utweigh the disadvantages. 从各方面考虑，我们可以看到利大于弊。
【写作任务】假定你是李华。某英文报社正在就选择大学专业时兴趣和就业前景(prspect)哪个更重要的问题对高三学生进行调查。以下是你所在班级同学的观点。请你给该报编辑写一封信，反映同学们的观点并表达你的看法。
注意：1．词数80左右；开头和结尾已给出，不计入总词数；2．可以适当增加细节，以使行文连贯。
Dear Editr, ___________________________________________________________________________________________________________________________________________________________________________________________________________Yurs faithfully，Li Hua
【写作指导】1．明确体裁为议论文。2．文章的时态以一般现在时为主，人称以第三人称为主。3．文章的结构框架为：第一段：介绍要讨论的话题；第二段：陈述双方不同的见解；第三段：表达自己的观点。
4．话题词汇运用：(1)进行一项调查________________(2)选择一个专业________________(3)考虑……________________(4)确保________________(5)压力大 ________________(6)由你决定________________
5．巧用句型成句(1)他们认为选择一个他们喜欢的专业将确保他们有一个快乐的大学生活。They think chsing a majr they like will ________ ________ ________ ________ cllege life. (2)但也有人反对，认为就业前景更重要。Hwever, thers ________ ________ ________ it. They think jb prspect f mre significance.
(3)一旦你做了决定，试着坚持下去，你肯定会有一个光明的未来。Once yu ________ ________ ________, try t stick t it and yu will surely have a bright future. (4)用that引导的同位语从句改写(1)______________________________________________(5)用现在分词作状语改写句(2)______________________________________________
Keys：4．(1)cnduct a survey(2)chse a majr(3)take…int cnsideratin(4)ensure(5)under great pressure(6)be up t yu
5．(1)ensure them a happy(2)are ppsed t(3)make the decisin(4)They hld the view that chsing a majr they like will ensure them a happy cllege life. (5)Hwever, thers are ppsed t it, thinking jb prspect f mre significance.
One pssible versin：Dear Editr，Recently a survey has been carried ut n which is mre imprtant in chsing a majr in cllege: interest r jb prspect. Sme students prefer interest and they hld the view that chsing a majr they like will ensure them a happy cllege life and give them mre mtivatin t study. Therefre, they will have the pprtunity t get a jb satisfying their interest.
Hwever, thers are ppsed t it, thinking jb prspect f mre significance. They think cllege graduates are under great pressure in finding a jb, s jb prspect shuld be taken int cnsideratin. After all, getting a gd jb is very imprtant fr graduates.
Every cin has tw sides. Frm my pint f view, it’s up t yu t decide which is mre imprtant. Once yu make the decisin, try t stick t it and yu will surely have a bright future. I hpe yu will find my article useful. Yurs faithfully，Li Hua
近年来，禽流感频发，一些国家在疫区捕杀所有鸟类。对此，你们班开展了主题班会，讨论结果如下：赞成捕杀者认为：1．防止病毒扩散、威胁人类健康；2．疫区扩大，不易治愈。
反对捕杀者认为：1．捕杀鸟类，不公平，太残忍；2．尽快找到疫苗。你的态度：……参考词汇：禽流感bird flu；家禽pultry；病毒virus；疫苗vaccine
注意：1．词数80左右；2．可以适当增加细节，以使行文连贯。__________________________________________________________________________________________________________________________________________
【答案】One pssible versin：As it is well-knwn that bird flu has spread thrugh many cuntries. Peple have taken sme measures t prevent it. Sme think it is necessary t kill all the pultry and birds. At present it is nly a gd way t prevent the deadly virus frm spreading and harming peple’s health. The mre the virus spreads, the mre difficult it is t cnquer it.
Hwever, thers think it is unfair and awfully cruel t d s just fr the benefit f human beings. Finding vaccines as quickly as pssible is the mst imprtant thing. As far as I’m cncerned, catching and killing birds is nt necessary. It may cause the birds t die ut. Als, birds are friends t us human beings. We shuld prtect them very well.
1．paragraph n.________________2．crrespnding adj.________________3．differ vi.______________________4．identify vt._________________________
(文章的)段，段落 相应的；对应的 不同，不一样；有异意 确认，发现；认出，识别
1．leave ut_________________________2．break ut_____________________________3．be divided int…__________________________4．avid ding sth.__________________________5．fight against__________________________
省去；遗漏；不考虑 (战争，火灾，疾病等)爆发，发生 被分成…… 避免做某事 抵抗
1．(P62)An epidemic is the rapid spread f an infectius disease ver a shrt perid f time, ________ ________ ________ ________ ________ ________(导致了大量的死亡), the number f which differs fr different diseases. (现在分词作结果状语)【答案】causing a large number f deaths
2．(P63)…use linking wrds ________ ________(必要之处). (省略结构)【答案】where necessary
1．crrespnding adj. 相应的；对应的 (P62)Crrespnding paragraphs【翻译】相应的段落
【语言提升】He has gt bth crrespnding educatin and talents and is equal t this jb. 他既接受过相应的教育又有天赋，可以胜任这份工作。crrespnd vi. 相一致；相符合；通信crrespnd with/t…与……一致/相符/通信Yur accunt f events des nt crrespnd with/t hers. 你对事情的陈述与她说的不相符。
crrespnd with…与……通信I used t crrespnd with my friends by letters while nw the Internet is mre cnvenient. 我过去常写信与我的朋友联络，而现在有了互联网就更方便了。
【针对练习】单句语法填空(1)We shuld try t keep ur actins ________(crrespnd) with ur wrds because nly in this way can we win the trust f thers. (2)The written recrd f his cnversatin didn’t crrespnd ________ what was actually said. 【答案】(1)crrespnding (2)t/with
完成句子(3)Actually, all f us desire t achieve success, but smetimes ur actins dn’t ________ ________ what we desire. 实际上，我们所有人都渴望成功，但是有时候我们的行动与目标并不一致。【答案】(3)crrespnd with
2．leave ut省略；遗漏；忽视 (P62)Cmpare the summary with the riginal text, what infrmatin is included and what is left ut?【翻译】比较摘要和原文，哪些信息被包含了，哪些被遗漏了？
【语言提升】He hadn’t been asked t the party and was feeling very left ut. 他未被邀请参加聚会，感到颇受冷落。On the ther hand, we dn’t want t leave ut any essential detail either. 在另一方面，我们也不想遗漏任何重要的细节。
leave alne不管；别惹；让某人一个人待着I just want t be alne, s leave me alne!我只想一个人待着，所以让我一个人待着吧！leave behind留下；遗留Oh dear! The travelling bag has been left behind. 哎呀！旅行袋忘了拿了。
leave (A)fr B 离开(A)去BIt’s wise t check whether the flight times have changed befre yu leave fr the airprt. 出发去机场之前核实一下航班起飞时间是否有变化，这是明智的做法。leave ver剩下，留下We will leave this pie ver fr tmrrw. 我们把这块馅饼留到明天吃。
【针对练习】完成句子(1)Yu’ve made a mistake—yu ________ ________________ the letter “e”. 你出了一个错, 把字母e 落了。(2)Dn’t ________ any f yur belngings ________. 不要留下你的任何东西。【答案】(1)have left ut (2)leave; behind
(3)They ________ ________ ________ Shanghai tnight as planned. 他们将按计划于今晚动身去上海。(4)I feel annyed right nw. S yu might as well ________ ________ ________. 我正烦着呢。所以你最好别惹我。【答案】(3)will leave fr (4)leave me alne
(5)There were sme chairs ________ ________ when everyne had sat dwn. 大家坐下后，还剩下一些椅子。【答案】(5)left ver
3．differ vi. 不同，不一样；有异议 (P62)An epidemic is the rapid spread f an infectius disease ver a shrt perid f time, causing a large number f deaths, the number f which differs fr different diseases. 【翻译】流行病是指一种传染病在短时间内迅速传播，造成大量死亡，而死亡人数因疾病的不同而不同。
【语言提升】differ frm… 与……不同Human beings differ frm animals in that the frmer is capable f using language. 人类与动物的不同在于前者能够使用语言。differ in… 在……方面不同Peple differ in their attitudes twards failure. 人们对失败持有不同的态度。
different adj. 不同的be different frm…in…在……方面与……不同His public image is very different frm the real persn. 他在公众心目中的形象与他真实的本人截然不同。
difference n. 差异，不同，区别tell the difference between A and B 说出A和B之间的区别Yu can always tell the difference between the turists and the natives. 游客与当地人之间的区别一望即知。
make a difference起作用，有影响I wanted t make a difference in the wrld smehw, but I had n idea hw t d that. 我想以某种方式在世界上有所作为，但我不知道该怎么做。
【针对练习】单句语法填空(1)The tw prducts differ ________ quality and prices. (2)In sme respects, develping cuntries are definitely ________ (differ)frm develped cuntries. 【答案】(1)in (2)different
(3)I vlunteer because I want t nt just see the wrld, but make a ________(different)in it. (4)Jhnsn didn’t seem t be able t tell the difference between right ________ wrng. 【答案】(3)difference (4)and
完成句子(5)Sustainable turism, which ________ ________ ther kinds f turism, will d n harm t ur envirnment. 与其他类型的旅游不同，可持续发展的旅游不会破坏环境。【答案】(5)differs frm
4．break ut (战争、火灾、疾病等)发生，爆发(P62)Sme hundred years later, the Great Flu epidemic brke ut in 1918, als knwn as the Spanish Flu, killing 50 millin peple. 【翻译】几百年后，1918年爆发了大流感，也被称为西班牙流感，造成5000万人死亡。
【语言提升】break ut爆发；突发；掏出；摆脱Where were yu living when war brke ut?战争爆发时你住在哪儿？
Mst f peple had left befre the fire brke ut. 大多数人在火灾发生之前已经离开。She needed t break ut f her daily rutine and d smething exciting. 她需要从日常事务中解脱出来，找点有意思的事做。
break away frm摆脱，脱离，逃离One f the things I lve abut travel is the chance t break away frm daily rutines and frm sme new nes. 旅途中我喜爱的一点就是我有机会可以打破常规生活，形成一些新的生活习惯。
break in打断，插嘴；闯入She lnged t break in n their cnversatin but didn’t want t appear rude. 她很想打断他们的谈话，但又不愿显得粗鲁。break int闯入A burglar tried t break int ur huse last night. 昨晚一个窃贼试图闯入我们的房子。
break up分手；解散A neighbur asked fr the music t be turned dwn and the party brke up. 一位邻居要求调小音乐，聚会便散了。
break dwn出毛病；(身体)垮掉；(精神)崩溃；失败；分解Her health brke dwn under the pressure f wrk. 她因工作压力身体垮掉了。Talks between management and wrkers brke dwn ver the issue f hliday pay. 劳资双方就假日工资的谈判失败了。
【针对练习】完成句子(1)She went thrugh a perid f emtinal adjustment after her marriage ________ ________. 婚姻破裂后，她熬过了一段感情调整期。 【答案】(1)brke up
(2)When the bus ________ ________, she and her husband were able t fix it with a cat hanger and a piece f wd. 当公共汽车抛锚时，她和她的丈夫用一个衣架和一块木头把它修好了。 【答案】(2)brke dwn
(3)They had escaped t America shrtly befre the war ________ ________ in 1939．1939年战争爆发前不久他们逃到了美国。【答案】(3)brke ut
(4)If yu can’t affrd t take a 15-minute ________ ________ ________ yur desk and cmputer screen, take a mini-break by standing up and stretching. 如果你不能挤出15分钟的休息时间来离开办公桌和电脑屏幕，也要稍微休息，站起来，伸展一下筋骨。【答案】(4)break away frm
5．adaptatin n. 适应；改编本 (P62)The 1997 bird flu which claimed ver 100 lives was an adaptatin f the Great Flu f 1918．【翻译】1997年造成100多人死亡的禽流感是1918年大流感的一种改版。
【语言提升】adapt vt. 使适应；改编 vi. 适应adapt (neself)t…使(自己)适应……It tk him a while t adapt himself t his new surrundings. 他过了好一阵子才适应了新环境。
be adapted t…适应……Desert plants are adapted t cping with extreme heat. 沙漠植物适于耐酷热。adapt…fr…把……改编成……Three f her nvels have been adapted fr televisin. 她的长篇小说中有三部已改编成电视节目。
be adapted frm…改变自……Gne With the Wind is an American rmance film adapted frm the nvel f the same name. 《飘》是一部美国浪漫爱情电影，改编自同名小说。adaptable adj. 能适应的Tmrrw’s wrkers will have t be mre adaptable. 未来的工人必须具有更强的适应性。
【温馨提示】adapt (neself)t…与be adapted t…中的t为介词，后跟名词、代词或动名词作宾语。Sn they adapted t living in the cuntryside. 他们很快就适应了在乡下住。
【针对练习】单句语法填空(1)I find it very difficult t adapt myself ________ the climate in the high muntains. (2)D yu think the film ________(adapt)was faithful t the bk?(3)I’m sure she’ll deal with the changes very well; she is very ________(adapt). 【答案】(1)t (2)adaptatin (3)adaptable
完成句子(4)The film ________ ________ ________ ________ a play f the same title. 电影改编自一部同名戏剧。【答案】(4)has been adapted frm
(P63)…use linking wrds where necessary. 【翻译】……必要之处使用连词。【句式剖析】本句中“where necessary”是一种从句的省略形式，补全为“where it is necessary”。
【归纳拓展】当从句的主语和主句的主语一致，且从句中包含be动词时或从句的主语为it is时，可以省略从句的主语和be动词，从而形成“连词＋v. -ing/v. -ed”这个结构。When cmparing different cultures, we ften pay attentin nly t the differences withut nticing the many similarities. 当我们比较不同的文化的时候，我们常常只留意差异而忽视许多相同的地方。
Unless invited, I wn’t attend the party. 除非受到邀请，否则我不参加晚会。Once expsed t light, the film will be damaged and get useless. 一旦暴露在光线下，胶卷就会损坏，变得无用。
【针对练习】单句语法填空(1)Dn’t say anything unless ________(ask). (2)If ________(see)frm the tp f the hill, the city lks mre beautiful. (3)When ________ (buy)a gift fr thers, yu shuld first think f what he r she is fnd f. 【答案】(1)asked (2)seen (3)buying
完成句子(4)________ ________ the patient can then visit his dctr fr further advice. 如果必要的话，病人可向自己的医生咨询以得到更多的建议。 【答案】If necessary
1．argue fr/against赞成/反对2．argue that…主张, 认为3．hld different pinins持有不同的观点4．as far as I’m cncerned在我看来
5．in favr f支持6．play an imprtant part/rle in…在……中起重要的作用7．take measures t d sth. 采取措施做某事8．It is knwn t us that…众所周知……
【引人入胜的开头句】1．Recently a survey has been carried ut n which is mre imprtant in…最近，做了一项关于……更重要的调查。2．Peple have taken/adpted different attitudes twards…人们对……采取了不同的态度。
【精彩纷呈的篇中句】1．Sme peple hld the view that…有些人认为……2．Hwever, thers are ppsed t it, thinking…f mre significance. 然而，另一些人则持反对意见，认为……更重要。
【回味无穷的结尾句】1．Every cin has tw sides. Frm my pint f view, I argue fr the frmer. 事物都有两面性。在我看来，我赞成前者。2．All things cnsidered, we can see that the advantages utweigh the disadvantages. 从各方面考虑，我们可以看到利大于弊。
【写作任务】假定你是李华。某英文报社正在就选择大学专业时兴趣和就业前景(prspect)哪个更重要的问题对高三学生进行调查。以下是你所在班级同学的观点。请你给该报编辑写一封信，反映同学们的观点并表达你的看法。
注意：1．词数80左右；开头和结尾已给出，不计入总词数；2．可以适当增加细节，以使行文连贯。
Dear Editr, ___________________________________________________________________________________________________________________________________________________________________________________________________________Yurs faithfully，Li Hua
【写作指导】1．明确体裁为议论文。2．文章的时态以一般现在时为主，人称以第三人称为主。3．文章的结构框架为：第一段：介绍要讨论的话题；第二段：陈述双方不同的见解；第三段：表达自己的观点。
4．话题词汇运用：(1)进行一项调查________________(2)选择一个专业________________(3)考虑……________________(4)确保________________(5)压力大 ________________(6)由你决定________________
5．巧用句型成句(1)他们认为选择一个他们喜欢的专业将确保他们有一个快乐的大学生活。They think chsing a majr they like will ________ ________ ________ ________ cllege life. (2)但也有人反对，认为就业前景更重要。Hwever, thers ________ ________ ________ it. They think jb prspect f mre significance.
(3)一旦你做了决定，试着坚持下去，你肯定会有一个光明的未来。Once yu ________ ________ ________, try t stick t it and yu will surely have a bright future. (4)用that引导的同位语从句改写(1)______________________________________________(5)用现在分词作状语改写句(2)______________________________________________
Keys：4．(1)cnduct a survey(2)chse a majr(3)take…int cnsideratin(4)ensure(5)under great pressure(6)be up t yu
5．(1)ensure them a happy(2)are ppsed t(3)make the decisin(4)They hld the view that chsing a majr they like will ensure them a happy cllege life. (5)Hwever, thers are ppsed t it, thinking jb prspect f mre significance.
One pssible versin：Dear Editr，Recently a survey has been carried ut n which is mre imprtant in chsing a majr in cllege: interest r jb prspect. Sme students prefer interest and they hld the view that chsing a majr they like will ensure them a happy cllege life and give them mre mtivatin t study. Therefre, they will have the pprtunity t get a jb satisfying their interest.
Hwever, thers are ppsed t it, thinking jb prspect f mre significance. They think cllege graduates are under great pressure in finding a jb, s jb prspect shuld be taken int cnsideratin. After all, getting a gd jb is very imprtant fr graduates.
Every cin has tw sides. Frm my pint f view, it’s up t yu t decide which is mre imprtant. Once yu make the decisin, try t stick t it and yu will surely have a bright future. I hpe yu will find my article useful. Yurs faithfully，Li Hua
近年来，禽流感频发，一些国家在疫区捕杀所有鸟类。对此，你们班开展了主题班会，讨论结果如下：赞成捕杀者认为：1．防止病毒扩散、威胁人类健康；2．疫区扩大，不易治愈。
反对捕杀者认为：1．捕杀鸟类，不公平，太残忍；2．尽快找到疫苗。你的态度：……参考词汇：禽流感bird flu；家禽pultry；病毒virus；疫苗vaccine
注意：1．词数80左右；2．可以适当增加细节，以使行文连贯。__________________________________________________________________________________________________________________________________________
【答案】One pssible versin：As it is well-knwn that bird flu has spread thrugh many cuntries. Peple have taken sme measures t prevent it. Sme think it is necessary t kill all the pultry and birds. At present it is nly a gd way t prevent the deadly virus frm spreading and harming peple’s health. The mre the virus spreads, the mre difficult it is t cnquer it.
Hwever, thers think it is unfair and awfully cruel t d s just fr the benefit f human beings. Finding vaccines as quickly as pssible is the mst imprtant thing. As far as I’m cncerned, catching and killing birds is nt necessary. It may cause the birds t die ut. Als, birds are friends t us human beings. We shuld prtect them very well.
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