九年级下册英语第13单元SectionA2PPT课件

1、1unit 13section a 3a-4c2学习目标 key words & phrases: method，cruel，harmful，industry，law，afford，take part in，turn off，pay for key sentences: 1. were trying to save the earth. 2. the river used to be so clean. 3. the air is badly polluted. 3新课导入新课导入4there are some animals are endangered. we should do some

2、thing to protect the animals and the environment! 5the zoos provide homes for many endangered animals. 61. have you ever seen a shark（鲨鱼）（鲨鱼）?2. what do you know about sharks?7课文展现课文展现8where shark fin soup is popularnumber of sharks caughtand traded every yearhow government can helptwo environmental

3、 groups against “finning”southern china70 milliondevelop laws to stop the sale of shark finswildaid and the wwf3aread the passage about sharks and complete the fact sheet below.93bread the passage again and fill in the blanks with the words in the box.so although if but when many people do not reali

4、ze they are killing a whole shark _ they enjoy a bowl of shark fin soup.2. sharks are at the top of the food chain, _ if their numbers drop, the oceans ecosystem will be in danger.whenso103. many think that sharks are too strong to be endangered, _ they are wrong.4. _ there are no scientific studies

5、 to support this, a lot of people believe that shark fins are good for health.5. sharks may disappear one day _ we do not do something to stop the sale of shark fins.butalthoughifadj. 科学上的，科学的科学上的，科学的11retell the passage according to the words below.shark fin soup in southern china each time cut off

6、 no longer not onlybut also at the top drop be endangered the strongest around 70 million fallen by over 90 percent wildaid and the wwf develop laws scientific studies 12131. a shark can no longer swim and slowly dies. 鲨鱼不能再游泳然后慢慢死掉。鲨鱼不能再游泳然后慢慢死掉。no longer意思是意思是“不再不再” e.g. im no longer a student. 我不

7、再是个学生了。我不再是个学生了。 有两个短语和有两个短语和no longer同义，即同义，即notany longer和和notany more，但他，但他们侧重的方面不同。们侧重的方面不同。14no longer和和notany longer侧重时间。侧重时间。 e.g. he no longer lives here. = he doesnt live here any longer. 他不在这儿居住了。他不在这儿居住了。(一个时间以前他住一个时间以前他住 在这儿，过了这个时间，他就离开了。在这儿，过了这个时间，他就离开了。) notany more侧重程度和数量侧重程度和数量e.g. y

8、ou can drink no more. = you cant drink any more. 你不能再喝了。你不能再喝了。(喝酒的量到了一定程喝酒的量到了一定程 度，不能再继续下去了。度，不能再继续下去了。) 152. this method is not only cruel, but also harmful to the environment. 这种方法不但残忍而且对环境有害。这种方法不但残忍而且对环境有害。not onlybut also用于连接两个表示并列关系的成分，着用于连接两个表示并列关系的成分，着重强调后者，其意为重强调后者，其意为“不仅不仅而而且且”; 其中的其中的al

9、so有时可以省略。有时可以省略。16e.g. she not only plays well, but also writes music. 她不但很会演奏，而且还会作曲。她不但很会演奏，而且还会作曲。 not only men but also women were chosen. 不仅仅是男的，女的也有被选中的。不仅仅是男的，女的也有被选中的。 17若连接两个成分作主语，其谓语通常与靠近的若连接两个成分作主语，其谓语通常与靠近的主语保持一致。主语保持一致。e.g. not only you but also he has to leave. 不只是你，他也得离开。不只是你，他也得离开。 n

10、ot only放在句首，后接句子时要用倒装结构。放在句首，后接句子时要用倒装结构。 e.g. not only had the poor man been fined, but also he had been sent to prison. 这个可怜的人不仅被罚款，而且还被这个可怜的人不仅被罚款，而且还被 送进了监狱。送进了监狱。 18be harmful to 对对有害有害e.g. smoking is harmful to the health. 吸烟有害健康。吸烟有害健康。 playing computer games much is harmful to students. 电脑游戏

11、玩太多对学生有害。电脑游戏玩太多对学生有害。193. sharks are at the top of the food chain in the oceans ecosystem. 鲨鱼位于海洋生物系统食物链的顶部。鲨鱼位于海洋生物系统食物链的顶部。at the top of 在在最高地位最高地位; 用最高用最高最大最大的的(速度速度, 声音等声音等) e.g. i looked at the top of his head, his hair shiny and parted smoothly. 我看他的头顶我看他的头顶, 头发闪亮且平滑的分头发闪亮且平滑的分 开。开。20he shout

12、ed at the top of his voice in order that he might be heard.他尽力大声叫喊他尽力大声叫喊, 以便别人能听见。以便别人能听见。214. if their numbers drop too low, it will bring danger to all ocean life. 如果它们的数目降至过低，会给所有如果它们的数目降至过低，会给所有 海洋生物带来危险。海洋生物带来危险。 此句复数形式的此句复数形式的numbers表达全海洋中鲨表达全海洋中鲨 鱼的总量。当表示数值的高或低时，鱼的总量。当表示数值的高或低时，number要用要用hig

13、h或或low修饰。修饰。22e.g. in that country, the number of children going to school is higher in cities than in towns and village. 在那个国家，城市儿童入学人数比乡镇在那个国家，城市儿童入学人数比乡镇 及及农村要高。农村要高。常与常与number搭配的动词有搭配的动词有grow, fall等。等。e.g. the number of families that own cars has been growing quickly recently. 近来拥有轿车的家庭数量增长很快。近来

14、拥有轿车的家庭数量增长很快。235. environment protection groups around the world, such as wildaid and the wwf, are teaching the public about “finning”. 世界各地的环境保护组织，如野生救援协世界各地的环境保护组织，如野生救援协 会和世界自然基金会，都在教育公众有关会和世界自然基金会，都在教育公众有关 “猎翅猎翅”的行为。的行为。1) 句中句中fin本为名词，指本为名词，指 “鱼鳍鱼鳍”。此句中的。此句中的 finning由动词化的由动词化的fin（割鲨鱼鳍以获取（割鲨鱼鳍以获

15、取 鱼翅）的鱼翅）的-ing形式转化而成，指课文中所形式转化而成，指课文中所 陈述的陈述的 “猎翅猎翅”这一行为。这一行为。24 2) wildaid和和wwf组织组织 wildaid（美国野生救援协会）（美国野生救援协会）是保护野生动物及栖息地环境是保护野生动物及栖息地环境的一个非盈利性的机构，的一个非盈利性的机构，1999年注册成立，其宗旨是保护及年注册成立，其宗旨是保护及救助世界范围内的野生动物；救助世界范围内的野生动物；wwf（世界自然基金会）英（世界自然基金会）英文全称为文全称为world wide fund for nature，成立于，成立于1961年，是享年，是享有国际盛誉，全

16、球最大的独立有国际盛誉，全球最大的独立性非政府环境保护组织之一。性非政府环境保护组织之一。25pay attention to the sentences.1. were trying to save the earth.2. the river used to be so clean.3. the air is badly polluted.4. no scientific studies have shown that shark fins are good for health.5. we should help save the sharks.present progressiveus

17、ed topassive voicepresent perfectmodal verbs26现在进行时现在进行时: : present progressive结构结构: be (am/is/are) + v.-ing标志词：标志词：look, listen, now, right nowe.g. look! the boy is crying.定义：定义：表示说话时表示说话时(瞬间瞬间)正在进行正在进行的动作的动作, 也表示目前或现阶段也表示目前或现阶段正在进行的动作。正在进行的动作。 27what a fine day today! look! what are they doing?28u

18、sed to do sth. 表示过去常常做某事表示过去常常做某事, 而现而现 在往往不做了在往往不做了, 后接动词原后接动词原 形。形。be used to doing sth. 表示习惯于做某事表示习惯于做某事e.g. i used to get up at six oclock. joe is used to drinking a cup of coffee every morning.used to do与与be used to doing29translation.1. 她过去常常周末和朋友闲逛。她过去常常周末和朋友闲逛。 she used to hang out with frie

19、nds on weekends.2. 他习惯于每天晚上睡得很晚。他习惯于每天晚上睡得很晚。 he is used to staying up.30被动语态：被动语态：passive voice定义：定义：表示主语是动作的承受者，即行表示主语是动作的承受者，即行 为动作的对象的一种语态。为动作的对象的一种语态。结构：结构：be + 过去分词过去分词e.g. a new school was built last year. our classroom is cleaned every day.31translate the sentences by using passive voice.1.

20、刚才一些老年人参观了博物馆。刚才一些老年人参观了博物馆。2. 工人们使用不同种类的机器工作。工人们使用不同种类的机器工作。the museum was visited by some old people just now. different kinds of machines are used to work by the workers. 32结构结构: has/have + 过去分词过去分词标志词：标志词：already, yet, ever, never, since, fore.g. i havent finished my homework yet.定义：定义：表示动作已经完成表

21、示动作已经完成, 但对现在造成影但对现在造成影 响响; 或者表示从过去某一时间开始一或者表示从过去某一时间开始一 直延续到现在并还可能持续下去的直延续到现在并还可能持续下去的 动作。动作。 现在完成时现在完成时: present perfect33complete the following sentences. i _ (be) in beijing for two years.2. i _ never _ (hear) of that man before.3. tom _ (work) there since two years ago.have beenhaveheard has wo

22、rked344. the twins _ (wash) the clothes for an hour.5. he _ (play) basketball since three years ago.6. how long _ sally _ (sing) yet?have washedhas playedhassung351. 情态动词本身有一定的词义情态动词本身有一定的词义, 表示说话表示说话人的情绪、态度或语气人的情绪、态度或语气, 但不能单独作但不能单独作谓语谓语, 只能与其他动词构成谓语。只能与其他动词构成谓语。 常见的有常见的有: can (could), may (might),

23、 must, need, shall (should), will (would)等。等。情态动词情态动词362. 情态动词无人称和数的变化情态动词无人称和数的变化, 后接动词后接动词原形。否定式是在情态动词后面加原形。否定式是在情态动词后面加not。个别情态动词有过去式形式。个别情态动词有过去式形式, 可用来可用来表达更加客气、委婉的语气。表达更加客气、委婉的语气。 e.g. ken can climb up the tress like a koala. tracy could ride a bicycle when she was five years old. you mustnt p

24、lay with fire. it is dangerous.37translation.1. 我们不能在教室里吃东西。我们不能在教室里吃东西。2. 首先你必须完成作业。首先你必须完成作业。3. 他现在不可能在家。他现在不可能在家。4. 她一定知道这个问题的答案。她一定知道这个问题的答案。we cant eat in the classroom. you must finish your homework first. he cant be at home now. she must know the answer to this question.384afill in the blanks

25、 with the correct forms of the verbs in brackets.joe: _ you ever _ (take) part in an environmental project ?eric: yes, i have. i _ (help) with a clean-up day last year. it was _ (consider) the biggest clean-up project this city _ ever _ (have).have takenhelpedconsideredhadhad参加参加39joe: how many peop

26、le _ (take) part?eric: i _ (think) more than 1,000 people _ (come) to help out.joe: thats fantastic! i guess everyone in this city is _ (try) to improve the environment.eric: yes, we cant afford to _ (wait) any longer to take action!tookthinkcametryingwaitv. 承担得起承担得起( (后果后果) ); 买得起买得起404bfill in the

27、 blanks with the appropriate modal verbs from the box.people _ think that big things_ be done to save the earth. many forget that saving the earth begins with small things. for example, you _ savemay/mightmustcancan would couldhave to should mustmay/ might41electricity by turning off the lights when you leave a room. you _ also use reusable bags instead of plastic bags. i think its a great idea that you now _ pay for