高中英语Unit3UndertheseaPeriod7优秀教案新人教版选修7

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1、Period 7Listening Task，Talking and WritingTeaching aims1 Students will be able to find out the reasons why the population of sharksdecreases sharply.2 Studentswillbe ableto expressopinionswiththe politeexpressionslike：I don't think it is wise to.It would be better if we.It is a good idea to.I su

2、ppose it is right.I wonder if.3 Students will be able to persuade the local government to protect wildlife in a polite way.Teaching proceduresStep 1Before listeningShow students a picture of shark and tell them a fact that shark populations are decreasing rapidly.Step 2During listeningTask 1： Tellst

3、udentsJordon Davies is interviewingthe shark expertDon Jamesaboutthe sharks'situation.Firstread the statementsbelow.Thenlistenand numberthese statements in the order that they hear them. Shark populations grow at a very slow rate.A lot are killed because of modern fishing technology.Governments

4、shouldtakeactionso thatthe fishingof sharksisslowed down. Shark attacks get a lot of attention in the news. Shark populations are decreasing at a serious rate. Some species need to be protected. The chance of being bitten by a shark is actually very small. Millions of sharks are killed each year.Key

5、s：the order： 7 4 8 1 5 6 2 3Task 2 ： Listen again and answer the following questions：1 Should people be afraid of swimming in the sea?2 How many people are killed by sharks each year?3 Do sharks or people need to be protected？ Why?4 Why are so many sharks being killed?5Whydoes the shark'sbiology

6、affectshark populations？Complete the sentencesblow.A： Age for reproducing young_B： Time for the young to develop_C： Number of young_用心爱心专心16 How long have shark species been in existence?7 What does Don thinkwillhappen ifwe don'tslow down the fishingof sharks?Suggested answers ：1 No.2 Only a few

7、.3 Sharks need to be protectedas millionsare killedeach year by human beings ，whereas only a few human beings are killed each year by sharks.4 Sometimes theyare killedby accidentand sometimes on purpose.Forexample ，shark fin soup is a delicacy in some Asian countries.5 15 years ； 14 months ； 7 9.6 4

8、00 million years.7 Don thinks that many shark species will not be able to survive.Step 3Post listening( talking)Ask students to make up a dialogue according to the situation below.Suppose you were a citizen in a coastal city in China， shark hunt is a seriousproblem in your province.Try to persuade t

9、he local government to take action toprotect wild life in a polite way with the help of the following expressions：I don't think it is wise to.It would be better if we.It is a good/wise idea to.I suppose it is right.I wonder if.Why not.We'd better.Step 4HomeworkWritea persuasiveletterto the l

10、ocalgovernment to controlthe improperhunts.备课资料1 Killer WhalesCommon name：Killer WhaleScientific name： Orcinus orcaSize ：Females can reach lengths up to 24 feet and weigh between 3000 to 8000 lb.Males can reach lengths up to 27 feet and can weigh up to 12 000 lb.Calves are about 8 feet long and 300

11、to 400 pounds at birth.Where are they found?From the North Pole to the South Pole from the Indian Ocean to the Atlantic，用心爱心专心2killer whales are found in all oceans of the world.What do they eat?How do they get a name like“killer whale”？ Killer whales are one of the toppredatorsin the sea.As a group

12、 ， killerwhales are known to eat fish ，squid ， seals ，sea lions， penguins ， even other whales.But ， keep in mind， it would be difficult for a killer whale off the coast ofCaliforniatoeat a penguin.Killerwhales eatthe food(orprey)that'savailabletothem.For example ， a killer whale that lives in th

13、e northern Pacific can hunt harbor seals ， California sea lions ， and a variety of fish.A killer whale in the Antarcticcould find Weddell seals，leopard seals，and penguins!Researchersstudyingkillerwhales in the NorthwestPacifichave found thatsomepods feed primarily on fish and others seem to prefer m

14、arine mammals.A killer whale uses its sharp teeth to catch its prey.Killer Whale Highlights：Scientistshavedeterminedthatkillerwhalescanliveamaximum of35years.How ？ By lookingat a cross sectionof a killerwhale'stooth.Killerwhales ，likeothermarine mammals， produce a periodicgrowthlayeron the teeth

15、.Bycountingthese layers， scientists can estimate the animal's age.You can tell an adult male from an adult female by the shape of their dorsalfin.This is a male(photo below)，how do we know ？ A male's fin is very tall(up to6 feettall)andtriangularshaped.A femaleis shorter(3feet)andcurvesback

16、towardthe dorsal fin(see the picture of the mother/calf above)2 The earth'soceans can reachdepths of up to11 000 meters.Thatisdeep enoughto coverMt.Qomolangma！The oceans are incrediblylarge and containseveraldifferenthabitats.To make it easier to describe the various parts of the oceans， marines

17、cientistsusuallydividethe oceansintofivezones.Eachzone isdifferentmainlyas a result of how much sunlight reaches it.Most of the life in the ocean can be found in the first zone，which begins atthe surface and goes down about 200 meters.Becausethereissunlightatthis level ，plants are able to grow.Marin

18、e animals such as dolphins， sharks ， sea turtles andsea lions， and ofcoursea varietyoffish， live inthesunlitpartof theocean.Itis difficult to hide from other animals in this area.The second zone starts at 200 meters and goes down to about 1000 meters.Somesunlightcan reachthis level ，butitisnot enoug

19、h forplantstogrow.Because thiszone is relativelydark ， many of thecreaturesthatlivehereareable tomake light用心爱心专心3with their body.The light from these animals makes the water look like a sky withmoving stars in it.The thirdzone of the ocean isdark.Thisplace ， about 3000 meters deep， may notseem a li

20、kelyhabitat， but thereare more creatureshere than one might think.Mostof the animals that live here are black or red because of the lack of light.Below 4000 meters， the temperature is near freezing and there is no light atall.In fact， the zone is so dark and empty that scientists named this zone aft

21、erthe Greek word for“no bottom ” There is not much life to be found in this coldand unpleasantpartofthe ocean， but some smallcreaturesstillmanage tosurvivehere despite the high water pressure.The very deepest part of the ocean is found 2000 meters further down.At thisdepth ， the water pressure is ex

22、tremely high and life isverydifficultfor thefewcreatures that live here.Compared to the other zones， this one has very littlelife.Since there is no light here， some of the animals do not have eyes.Next time you look at the ocean from the beach or on a map， remember that whatyou are seeing is only the surface only the beginning of the large and variedadventure.用心爱心专心4