Unit 9 Period Ⅲ LESSON 3（课件）-【优化探究】2022-2023学年新教材高中英语选择性必修第三册同步导学案（北师大版2019）

Period Ⅲ　 LESSON 3 返回导航 下页 上页 北师英语 选择性必修第三册 必备知识 自主学习 关键能力 合作探究 课堂检测 素养达标 课时作业 巩固提升 返回导航 下页 上页 北师英语 选择性必修第三册 Part 1　课文预读 [原文呈现] EPIDEMICS EXPLAINED An epidemic① is the name given to an infectious disease that rapidly spreads to a large number of② people within a short period of time—usually two weeks or less. Epidemics have been happening for as long as③ there have been people living on Earth. They can be 返回导航 下页 上页 北师英语 选择性必修第三册 caused by several different factors④， such as a virus⑤ being carried into an area, or changes in the way people live, like more people living in an area, which increases the chances of them coming into contact with a virus or bacteria⑥. 返回导航 下页 上页 北师英语 选择性必修第三册 本句中given...是动词的过去分词短语作后置定语，修饰名词the name；that rapidly spreads to a large number of people是that引导的定语从句，修饰先行词disease。 本句是as long as 引导的状语从句。 返回导航 下页 上页 北师英语 选择性必修第三册 Each disease can only officially⑦ be classified as⑧ an epidemic once a certain number of deaths have occurred from the disease. The number of deaths is different for every disease. So a very rare⑨ disease will have a low baseline 10 and just a few cases of it in one place will be classified as an epidemic; as opposed⑪ to more common diseases, such as the flu, that have a higher baseline. The common cold is a widespread⑫ virus that affects millions of people, but it is not seen as⑬ being a serious enough condition to deserve the classification⑭ of epidemic. 返回导航 下页 上页 北师英语 选择性必修第三册 With recent press reports drawing parallels⑮ between bird flu and killer epidemics of the past, Jim Smith looks at the sometimes depressing⑯ history of epidemics for clues about how we can create a more positive future without epidemics. 本句中with recent press reports drawing是with复合结构作状语；how we can...作about的宾语。 返回导航 下页 上页 北师英语 选择性必修第三册 Since bird flu first appeared in 1997, it has taken more than a hundred lives. Many people fear it could be the next global epidemic, especially as scientists who have gone into detail studying tissue