Unit 3 Conservation Lesson 1 The Sixth Extinction(2) 语法课件 -2023-2024学年高中英语北师大版(2019)选择性必修第一册

Unit 3 Conservation Lesson 1 The Sixth Extinction（2） 高二年级英语学科 海淀·空中课堂（高中） 1 1 Activate 2 Discover 3 Practice CONTENTS 目 录 海淀·空中课堂（高中） 2 Activate 01 海淀·空中课堂（高中） 3 What is the function of the underlined clause in this sentence? If a sixth mass extinction occurs, scientists who have studied the issue believe that up to three quarters of all species on Earth could die out. 作定语 起修饰作用 定语从句 海淀·空中课堂（高中） 海淀·空中课堂（高中） 4 Relative Clauses 定语从句 A relative clause is a clause that usually modifies a noun or noun phrase and is introduced by a relative pronoun (which, that, who, whom, whose), a relative adverb (where, when, why), or a zero relative. 定语从句是由关系代词或关系副词引导的从句，其作用主要是作定语修饰主句中的某个名词或代词，相当于形容词。 海淀·空中课堂（高中） 海淀·空中课堂（高中） Discover 02 海淀·空中课堂（高中） 6 Exercise 1: Read the sentences and discuss the similarities and differences of them. 1. Extinctions, where entire species are wiped out, are not unusual in our Earth’s history. 2. These include the third mass extinction, known as the “Great Dying”, which killed 90% to 96% of all species. 3. A 2015 study by scientists who were based at Brown University and Duke University in the US, looked at how quickly species die out due to natural causes. 4. If a sixth mass extinction occurs, scientists who have studied the issue believe that up to three quarters of all species on Earth could die out. 5. We need to take steps to save endangered species, including setting up special areas where plants and animals can be protected. 海淀·空中课堂（高中） 海淀·空中课堂（高中） 7 1. Extinctions, where entire species are wiped out, are not unusual in our Earth’s history. 2. These include the third mass extinction, known as the “Great Dying”, which killed 90% to 96% of all species. 3. A 2015 study by scientists who were based at Brown University and Duke University in the US, looked at how quickly species die out due to natural causes… 4. If a sixth mass extinction occurs, scientists who have studied the issue believe that up to three quarters of all species on Earth could