Unit 3.1 Topic talk & Lesson 1-2022-2023学年高二英语课后培优分级练（北师大版2019选择性必修一）

Unit 3 Conservation Period 1 Topic talk & Lesson 1 ( 课文阅读能力集训 ) Ⅰ.明主旨大意 What's the main idea of the text? A．Protecting the environment is the only way to save the Earth. B．Difficulties and challenges faced by mankind in protecting the environment. C．The extinctions of species and the reasons and how to avoid the sixth extinction. D．Human activities will lead to the destruction of the Earth. Ⅱ.Read the text carefully and then choose the best answer. 1．How many times have there been when life on Earth has almost ended? A．Twice.　　　　　　 B．Three times. C．Six times. D．Five times. 2．What can we know from paragraph 2? A．Human activity has done harm to nature. B．It is unusual for species to die out naturally. C．Species die out quickly due to natural causes. D．There are few reasons why so many species are dying out. 3．Which is not the reason for extinctions according to scientists? A．The increase of the oxygen content of the sea. B．Volcanic eruptions and global warming. C．Asteroids hitting t