Unit 5 A delicate world Section A Understanding ideas （ppt课件+视频） -2022新外研版（2019）《高中英语》选择性必修第二册.rar

Section AUnderstanding ideasdecrease词性：_ 意思：_词性：_ 意思：_常用搭配decrease from to 从减少到decrease by 减少了decrease to 减少到on the decrease在下降练习：Our coal output is 4/5 of that of last yearthat is,it has decreased _ 20%.bytrap词性：_ 意思：_词性：_ 意思：_常用搭配be/get trapped(in/on/into)困于；陷于trap sb.into（doing）sth.诱骗某人(做）某事练习：Because of the greenhouse effect the Earth is warmed by gases _(trap)in the atmosphere.trappedowe词性：_ 意思：_常用搭配owe sb sth=owe sth to sb欠某人某物；把归功于某人our sb a lot/a great deal=owe a lot/a great deal to sb 非常感激某人owing to 由于练习：We owe a great deal _ our parents.to Leading inLeading inLeading inLeading inBefore readingBefore readingBefore readingBefore readingActivity 1Activity 1Activity 1Activity 1Activity 1Activity 1Activity 1Activity 1 What animals can you see in the picture?Penguins.Before readingBefore readingBefore readingBefore readingActivity 1Activity 1Activity 1Activity 1 What kind of changes would take place if cats,rats and rabbits were introduced to an environment like this?They would hunt the birds and eat the native vegetation,thus upsetting the local ecological balance.Fast reading.Fast reading.Match the main ideas with the related paragraphs.Para.1Para.3Para.2Para.4Para.5Para.6A.To protect native animals,invading animals species had to be removed.B.For biological chain,the islands recent story is really a tragic story.C.For some reasons,there were no cats in 2000.D.Macquarie Island is a UNESCO World Heritage Site.E.Because of biological chain,parakeets,the native to the island died out.F.The rat,mouse and rabbit problem should be solved once and for all.Activity 2Activity 2Activity 2Activity 2ReadthepassageandfindoutwhathappenedtoMacquarieIsland.Non-native species introduced to Macquarie Island attacked Non-native species introduced to Macquarie Island attacked native birds,and led to a substantial reduction of bird native birds,and led to a substantial reduction of bird population and even the extinction of parakeets.In addition,population and even the extinction of parakeets.In addition,non-native species ate and devastated the native vegetation.non-native species ate and devastated the native vegetation.All of this played a part in upsetting the natural harmony of All of this played a part in upsetting the natural harmony of the island.But now the islands ecology is on the road to the island.But now the islands ecology is on the road to recovery with human efforts.recovery with human efforts.Careful reading.Careful reading.Why is Macquarie Island a UNESCO World Heritage Site?A.Because it is halfway between Australia and Antarctica.B.Because it is in the South-west Pacific Ocean.C.Because many visitors like to go there.D.Because there are many precious native inhabitants.DWhat is the purpose of the islands introduction of cats?A.To kill rats and mice.B.To take over the island.C.To be food for the birds.D.To bring the island colourful.AWhat was the cause of the parakeets dying out?A.Their number was too large.B.The rabbits liked to eat them.C.Too many cats hunted the parakeets.D.The parakeets were eaten up by visitors.CWhen did the island have no cats?A.in the 1970s.B.In the 1980s.C.in 2000.D.In 2006.CWhere does this passage probably come from?A.A TV interview.B.A biologic report.C.A food advertisement.D.A book review.BActivity 3Activity 3Activity 3Activity 3ToanalysehowMacquarieIslandwassavedfromdestruction.ToinformreadersofthechaoscausedonMacquarieIslandbyhumans.ToentertainreaderswithafunnystoryaboutwhathappenedonMacquarieIsland.Tosuggestwaysinwhichanecosystemcanbeprotected.Reason:Chaos caused by humans are Reason:Chaos caused by humans are described from Paragraph 2 to 5.described from Paragraph 2 to 5.Activity 4Activity 4Activity 4Activity 4Organise information from the passage and complete flow chart.Action(s)Action(s)Purpose(s)Purpose(s)Result(s)Result(s)Humans arrived on Humans arrived on Macquarie Island.Macquarie Island.To live there.Rats and mice were brought there by accident,and threatened birds living.People brought cats.People brought cats.To control the rats and mice.Cats ate birds,too.Rabbits were introduced.Rabbits were introduced.To provide a source of food for humans.Rabbits multiplied and caused soil erosion,and the cat population increased and parakeets died out.Activity 4Activity 4Activity 4Activity 4Organise information from the passage and complete the table.A virus was released.To remove all the rabbits.The rabbit population decreased.Cats turned their attention to birds again for food,while rabbits gradually became immune to the virus.Traps and dogs were used.To catch the cats.With the last cat caught,the mouse and rat population began to increase.Poison was dropped.To remove invadingspecies once and for all.The Macquarie Island was declared pest-free.Thank youThank youThank youThank you