Unit 3 Lesson1 The Sixth Extinction Language Points 高中英语北师大版（2019）选择性必修第一册.pptxVIP

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Unit 3 Lesson1 The Sixth Extinction Language Points 高中英语北师大版（2019）选择性必修第一册.pptx

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extinctionn.灭绝，消亡extinctadj.灭绝的过去分词做定语base on 基于，以…为根据 n.选项 which is 灭绝b一次；曾经；一旦大量的百分比cmassive巨大的；大量的aStep 1 单词清扫Extinctions, where entire species are wiped out, are not unusual in our Earths history. In fact, over 90 percent of all species that ever lived are now extinct. In the last 500 million years, there have been five times when life on Earth has almost ended. These include the third mass extinction, known as the Great Dying, which killed 90% to 96% of all species. And the fifth event, which occurred 66 million years ago, caused the death of the dinosaurs. in fact事实上entire adj.全部的n.物种wipe out 消灭不同寻常的灭绝的times次数（time）的复数形式；时代v.包括大量的adv.几乎known as 被认为是；以…而闻名 n.事件 occurv.出现 deathn.死亡diev.死亡deadadj.死亡的 Step 2 句子切割：找出关系词、连词、介词、副词等Step 3 句子切割：找出固定搭配等成块短语Step 4 句子切割：找出v.Step 5 分析句子结构Extinctions, where entire species are wiped out, are not unusual in our Earths history. In fact, over 90 percent of all species that ever lived are now extinct. In the last 500 million years, there have been five times when life on Earth has almost ended. These include the third mass extinction, known as the Great Dying, which killed 90% to 96% of all species. And the fifth event, which occurred 66 million years ago, caused the death of the dinosaurs. V系S1v系SV系v1Vwhich is过去分词做定语，表被动v1Vvary v. 变化 variety n.种类；多样化Step 1 单词清扫The reasons for extinctions are varied. According to scientists, they include volcanic eruptions, asteroids hitting the Earth from space, changes in sea levels,the decrease of the oxygen content of the sea and global warming. Many scientists say we are now entering the Earths sixth mass extinction. This time, human activity will be to blame. v. 包括 variedadj.各种各样的 adj.火山的 n.喷发 space n.空间, 空白;太空level n.空水平, 层次 n./ v. 减少content n. 目录; 所含物；内容;含量blame v. 责怪句子切割分析结构variedadj.各种各样的 space n.空间, 空白;太空leveln.空水平, 层次decrease n./ v. 减少content n. 目录; 所含物；内容;含量blame v. 责怪vary v. 变化 variety n.种类；多样化include v. 包括volcanic adj.火山的eruption n.喷发The reasons for extinctions