【学霸笔记：同步精讲】23 UNIT 3 Section Ⅰ Period 2 课时练案 课文整体阅读 讲义--北师大版英语选择性必修第一册

Period 2　 课文整体阅读 1．What does the passage mainly talk about A．The sixth extinction． B．The extinctions in history． C．The steps to avoid extinction． D．The reason for extinction． 2．What's the main idea of paragraph 2 A．Species die out naturally． B．How quickly species die out． C．Why so many species are dying out． D．What effect human activity has on species． Read the text carefully and then choose the best answer． 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． 1．How much do you know about extinction Share it with your classmates． _____ _____ 2．What should we do to avoid species extinction _____ _____ 1．hunt vi．& vt．猎取，猎杀；搜寻，搜索；追踪，追捕 ①(教材p．110)Yes，many animals are illegally hunted for something they have． _____ ②Parent birds began to hunt for food for their young． _____ ③Police are hunting an escaped criminal． _____ 2．mass adj．大量的 n．群众；团；块；堆；大量；许多 ①(教材p．52)These include the third mass extinction，known as the “Great Dying”，which killed 90% to 96% of all species． _____ ②The hill appeared as a black mass in the distance． _____ ③There's a mass of work for her to do． _____ ④His music is commercial．It is aimed at the masses． _____ 3．decrease n．减少；减少的量vi．& vt．减少 ①(教材p．52)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． _____ ②They decreased the size of the group from 25 to 15． _____ ③The decrease in sales was almost 20 percent． _____ 4．affect vt．影响；侵袭；使感染；(感情上)深深打动；使悲伤 ①(教材p．53)It is clear that human activity has negatively affected all other species on Earth，including animals and plants． _____ ②They were deeply affected by the news of her death． _____ ③Arthritis is a crippling disease which affects people all over the world． _____ 1．(学会断句)Although it is not unusual/for species to die out naturally，the rate /at which this is now happening/is cause for concern． [分析]本句是一个_____。句中Although it is not unusual for species to die out naturally为_____从句；主句中的at which this is now happening为限制性定语从句，修饰先行词_____。 [翻译]_____ _____ 2．(学会断句)A 2015 study by scientists/who were based at Brown Unive ... ...