【文章內(nèi)容簡介】 ong. C．Not mentioned.[答案]　1—5　ABABCⅡ.補全信息選擇正確選項填入空白處，補全所給句子提供的信息：A．which occurred 66 million years agoB．when life on Earth has almost endedC．where entire species are wiped outD．where plants and animals can be protectedE．a(chǎn)t which this is now happeningF．who have studied the issue1．Extinctions， ，are not unusual in our Earth39。s history.2．In the last 500 million years，there have been five times ．3．And the fifth event， ，caused the death of the dinosaurs.4．Although it is not unusual for species to die out naturally，the rate is cause for concern.5．If a sixth mass extinction occurs，scientists believe that up to three quarters of all species on Earth could die out.6．For example，we need to take steps to save endangered species，including setting up special areas ．[答案]　1—6　CBAEFDⅢ.表格填空The meaning of extinctionEntire species are out.Extinctions and their consequencesThere have been times when life on Earth has almost ended.The third mass extinction killed 90% to 96% of all species.The fifth mass extinction caused the death of the ．If a sixth mass extinction occurs，up to three quarters of all species on Earth could out.Main reasons for extinctionsVolcanic eruptions.Asteroids hitting the Earth from space.Changes in levels．The of the oxygen content of the sea.Global warming.Human .Steps to avoid the sixth mass extinctionSave species.Change how we work and travel.Improve our methods．Stop the planet that we live on and start to protect it.細讀課文，完成下列任務(wù)Ⅰ.主旨匹配段落主旨大意 effect of human activity on species. consequences of the sixth extinction. to avoid a sixth extinction. mass extinctions in the history.[答案]　1—4　DABCⅡ.課文理解1．When did dinosaurs die out according to the passage?A．More than 500 million years ago.B．More than 66 million years ago.C．In the third mass extinction.D．In the fourth mass extinction.2．Which of the following is one of unnatural reasons for extinctions?A．Volcanic eruptions.B．Asteroids hitting the Earth.C．Changes in sea levels.D．Air and water pollution.3．What has made the species on Earth die out at a higher rate?A．Natural causes.B．Global warming.C．Human activity.D．No clean water.4．Why do we need to change the way we live now?A．To avoid a sixth extinction.B．To live with others in peace.C．To save natural sources of energy.D．To work better and travel faster.[答案]　1—4　BDCAⅢ.概要寫作微技能概要寫作微技能——找出文中各個段落的主題句并進行高度概括1．：In the last 500 million years，there have been five times when life on Earth has almost ended. →高度概括為：There have been five mass extinctions in the history.2．：They found that human activity is causing species to die out 1，000 times faster than normal.→高度概括為：It is human activity that is causing species to die out much faster.3．：Of course，as we humans depend on so many species for our survival，we would also be at risk of dying out. →高度概括為：Man is also at risk of dying out.4．：Can a sixth extinction be avoided？Experts say that it is not yet too late，if we take action now. →高度概括為：The sixth extinction can be avoided if we take action now.1．conserve v．保存；保護；儲藏→conservation n．保護→conservative ；守舊的2．recycle vi.amp。 ，回收利用→recyclable →unrecyclable 3．threat n．威脅；(災(zāi)難等壞事)發(fā)生的可能→threaten v．威脅；恐嚇；危及→threatened 4．inform ；告知→information n．信息→informative ；知識性強的5．legal →legally →illegally ，違法地6．extinct ，絕種的→extinction n．滅絕；絕種；消亡7．incredible ；難以置信的→incredibly ，極端地8．urge v．督促；敦促；力勸→urgent ，急迫的→urgency n．緊迫；急迫9．usual ，通常的；尋常的，慣常的→unusual ；不平常的10．vary v．變化→varied ，形形色色的→variety n．變化；品種；種類11．endanger ，使遭受危險→endangered 1．decrease vi.amp。 n．減少；減少的量①The population began to decrease. ②They decreased the size of the group from 25 to 15. ③The decrease in sales was almost 20 percent. ；減少的量2．a(chǎn)ffect v．影響；侵襲；使感染；(感情上)深深打動①Your opinion will not affect my decision. 影響②They were deeply affected by the news of her death. 深深打動③Arthritis is a crippling disease which affects people all over the world. 使感染W(wǎng)ords and Phrases　switch vi.amp。 ，改變(教材P108～109)We definitely need to switch to different forms of power as soon as possible.我們當然需要盡快轉(zhuǎn)到不同形式的能量。[例]　The remote control allows you to switch easily between TV channels.遙控器讓你在不同電視頻道之間輕松地轉(zhuǎn)換。[知識拓展]switch off 　　 切斷(電源、氣體等)switch on 打開(開關(guān))；接通(電源等)switch (from...) to... (從……)轉(zhuǎn)變成，(從……)轉(zhuǎn)換到switch sb. 和某人交換某物switch over 轉(zhuǎn)換；換臺，換頻道[即學即練]——單句語法填空①Switch off the TV before you go out.②She switched on the lamp because it was dark.③We asked them if they would switch places with us.[小片段填空]Lucy returned home from work changing clothes，she switched off the light and came she switched on the TV and switched over with boredom.露西早早下班回到家。換完衣服后，她關(guān)掉燈來到樓下。然后打開電視機，無聊地換著頻道?！rgent ，急迫的(教材P109) That39。s an incredibly urgent matter...這是一件非常緊急的事……[例]　He asked to see the manager for something urgent.他有急事求見經(jīng)理。[知識拓展](1)urge v．　　　 催促；力勸；強烈要求urge do sth. 敦促某人做某事urge that sb.(should) do... 敦促某人做某事urge sb. 向某人提出/力陳某事(2)urgency n. 緊急的事[即學即練]——單句語法填空①The report urged that all children (should) be taught(teach) to swim.②He denounces people who urge him to change(change) his ways.③I need not press on you the urgency(urgent) of the matter.[小片段填空]Mr Zhang urged that his daughter (should) study abroad(極力主張女兒出國留學)．Whenever he talked to her on the phone，he would urge her to make preparations(督促她做準備)．To his great joy，his daughter went to study in Britain at last.　die out 消失；絕跡，滅絕(教材P52) How many times up to today has life on Earth almost died out?到今天為止，有多少次地球上的生命幾乎滅絕？[例]　As a result these endangered animals may even die ，這些瀕危動物甚至會滅絕。[知識拓展]die away 　 逐漸減弱，逐漸模糊，逐漸消失die down 逐漸降低，逐漸平息die off 相繼死去die of 死于(內(nèi)因)die from 死于(外因)[即學即練]——單句語法填空①As the region is being hotter，this kind of grass is dying off．②Their chatter and laughter die away as the group rushed out of the classroom.