2022年九年级英语13单元教案Unit13we’retryingtosavetheearth .pdf

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1、教材章节（单元）分析与设想单元名称Unit 13 were trying to save the earth!主要内容介绍知识结构框架本单元以“环境保护”为话题，通过讨论大气污染、水污染和废弃物污染等造成的原因以及我们如何做去改善环境，着重复习时态和语态等语法知识。单元教学目标1语言知识目标基本词汇：litter,advantage,bottom,fisherman,coal,ugly,cost,wooden,plastic,takeaway,bin,shark,fin,method,cruel.Harmful,chain,ecosystem,industry,law,scientific,a

2、fford,reusable,transportation,recycle,napkin,upside,gate,bottle,president,inspiration,iron,work,metal,creativity,基本词组：be harmful to,at the top(of sth.),take part in,turn off,take action,throw away,put sth.to good use,pull down,bring back 基本句型：We retrying to save the earth!The river used to be so cle

3、an.The air is badly polluted.No scientific studies have showed that shark fins are good for health.We should help save the sharks.2.技能目标:能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。3.情感目标:有环境危机意识，学会关注环境保护环境。教学重点1、能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型。2、保护环境的措施方法。教学难点能正确运用现在进行时，现在完成时，被动语态，情态动词和used to 句型课时

4、安排约需 6 课时课题名称Unit 13 were trying to save the earth!Section A 1a 1c小课时数第 1 课时教学过程教学过程详细内容师生活动个性彰显Predicting the answers Ss work in pairs to predict the answers to the activity,then play 主备教师合作教师授课类型fresh教学目标知识技能：Target language:We re trying to save the earth.People are throwing litter into the river.

5、The river used to be so clean.Everyone should help to clean up the river.1.Grammar:Present progressive,used to,modal verbs 2.Words and expressions;Curriculum words:litter,bottom,fisherman Useful expressions:be full of,put into,throw into,clean up,play a part in,close down 过程方法：According to designing

6、 some tasks,to train students listening ability and to train students communicative competence情感态度：Everyone should keep our rivers clean.教学重点Target Language 教学难点1How to train students listening ability2 How to train students communicative competence 教学准备教学过程详细内容师生活动个性彰显1a.To introduce Ss to the unit

7、 goal,talk about pollution and environmental protection.Picture:The four pictures show different forms of environmental pollution.The first picture on the left shows an airplane flying over some houses.The airplane seems to be flying a quite a low altitude,so the noise level must be quite high foe t

8、he people living in these houses.This is considered noise pollution.The second picture shows some vehicles give out exhaust fumes and causing air pollution.In the third picture,we see big chimneys giving off a lo of smoke and polluting the air.The last picture shows a rubbish dump hat pollutes the e

9、nvironment around it.What other things cause pollution?Ask Ss to complete the activity as a class,then work in pairs to think of more words to add to the lists for each column.1b.To help Ss recognize the target language in natural speech.Everyone needs to play a part:In the conversation,the boys are

10、 talking about the river in their town being polluted by litter and industrial waste.One of them wants to write to the government about the problem,but the other boy wisely says that cleaning up the river is everyone s responsibility,not just the government s.文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J

11、9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6

12、J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D

13、6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2

14、D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M

15、2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8

16、M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB

17、8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3文档编码:CB8C4Z10H6S9 HC1A3J10O10V6 ZB8M2D6J9K3the recording for Ss to fill in the gaps and review answers as a class.1c.To

18、 give Ss guided practice in using the target language to talk about pollution and environmental protection.Review of used to and should.板书设计Unit 13 we re trying to save the earth!Section A 1a 1cWe re trying to save the earth.(Present progressive)People are throwing litter into the river.The river us

19、ed to be so clean.(Used to)Everyone should help to clean up the river.(Modal verb)作业布置教学反思课题名称Unit 13 were trying to save the earth!Section A 2a 2d小课时数第2 课时主备教师合作教师授课类型fresh教学目标知识技能：Target language:People are throwing away things every day.People are littering in public places.To cut down air pollut

20、ion,we should take the bus or subway instead of driving.Our actions can make a difference and lead to a better future.Grammar:Present progressive,modal verbs Words and expressions;Curriculum words:coal,ugly,advantage,cost,wooden,plastic,takeaway,bin,Useful expressions:throw away,in public places,get

21、 worried,cut down,lead to 过程方法：According to finish some tasks to Train students listening ability and speaking ability情感态度：We must be fully aware of the importance of reducing pollution and protecting animals教学重点Target Language 教学难点How to train students listening ability教学准备文档编码:CR1J8E10I7X7 HF7F3A9

22、K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10

23、ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I

24、6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文

25、档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR

26、1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10

27、I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 H

28、F7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5教学过程教学过程详细内容师生活动个性彰显Providing an example 2d.To give Ss further practice in using the target language in conve

29、rsations.Extending the activity 板书设计Unit 13 were trying to save the earth!Section A 2a 2d People are throwing away things every day.People are littering in public places.To cut down air pollution,we should take the bus or subway instead of driving.Our actions can make a difference and lead to a bett

30、er future.作业布置教学过程详细内容师生活动个性彰显2a.To give Ss practice in learning for specific information.Culture Focus:Throwaway society In the conversation,Susan identifies“too much rubbish and waste”as a serious environmental problem.2b.To give Ss further practice in listening for specific information.Vocabulary

31、 Focus on some words used to talk about the things that are thrown away.?rubbish(British English)-things that people throw away?trash/garbage(American English)-things that people throw away?waste-rubbish and unwanted materials left behind after we have used something,e.g.industrial waste?litter-thin

32、gs that people have thrown away and left on the ground in public places 2c.To give Ss practice in using the target language in conversations.文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK

33、7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C

34、2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编

35、码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J

36、8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7

37、X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7

38、F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1

39、Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5教学反思课题名称Unit 13 were trying to save the earth!Section A 3a 4c小课时数第3课时主备教师合作教师授课类型fresh教学目标知识技能：Target language:No scientific studies have shown that shark fins are good for health.The number of some kinds of sharks have fallen be over 90 perce

40、nt in the last 20 to 30 years.Grammar:Present perfect Words and expressions;Curriculum words:shark,cruel,harmful,chain,ecosystem,industry,law,scientific,afford,reusable,transportation Useful expressions:be harmful to,at the top of,the food chain,take part in,turn off,pay for,take action 过程方法：Accordi

41、ng to finishing some tasks to train students integrating skills and train the ability of expressing students own opinions情感态度：Animals are our friends We must know how to love them and how to protect them That way,It is good for both animals and us 教学重点Target Language 教学难点How to improve students inte

42、grating skills教学准备教详细内容师生活动个性彰显文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7

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45、0 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S

46、2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L

47、5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:

48、CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5文档编码:CR1J8E10I7X7 HF7F3A9K1Q10 ZK7S2I6C2L5教学过程教学过程详细内容师生活动个性彰显show that they are opposite or ve

49、ry different in meaning.e.g.The children stopped plying when they heard the bell.4c.To prompt Ss to think about ways of protecting the environment.To reinforce the target language for talking about environmental protection.Let s talk about Make a list of things that people can do to help protect the

50、 environment.板书设计Unit 13 were trying to save the earth Section A 3a 4cNo scientific studies have shown that shark fins are good for health.The number of some kinds of sharks have fallen be over 90 percent in the last 20 to 30 years.作业布置学过程3a.To give Ss practice in reading for specific information.Le