Unit 9 Human Biology Lesson 3 Epidemics Explained 课件-2024-2025学年高中英语北师大版（2019）选择性必修第三册

UNIT 9 HUMAN BIOLOGY LESSON 3 （第一课时） EPIDEMIC EXPLAINED 1.an infectious disease 2.a large number of 3.within a short period of time 4.two weeks or less 5.as long as 6.be caused by 7.carry into 8.come into contact with 9.be classified as 一种传染病 3.在短时间内 4.两周或更短时间 7.带入 扫清阅读障碍 2.大量的 5.只要......就 6.由...导致 8.和......接触 9.将......分类 将下列短语汉意标注到课本58页前三段中 10.a certain number of 11.the number of 12.as opposed to 13.millions of 14.killer epidemics 15. creative a more positive future 10.一定数量的 12. 相对于...... 13.成百上千万 扫清阅读障碍 11. ........的数量 14.致命的传染病 15.创造一个更美好的未来 Para. 1 : The definition of an epidemic. Para. 2 : The criteria(标准) of identifying an epidemic. Para. 3 : Examples of epidemics in history. 段落大意： 4 流行病是指在短时间内(通常两周或更短)迅速在大量人群中传播的传染性疾病。 自地球上有人类生活以来，流行病就一直存在。 Para 1：An epidemic is the name given to an infectious disease that rapidly spreads to a large number of people within a short period of time—usually two weeks or less. Epidemics have been happening for as long as there have been people living on Earth. 后置定语 定语从句，在从句当中做主语 用法（1）引导条件状语从句。 You can pass the exam as long as you study hard. （2）时间长度（长达…之久）强调动作或状态的持续时间 The meeting lasted as long as three hours. as long as 引导时间状语从句， 表示主句动作持续的时间范围 它们可能由不同因素引起，例如病毒被带入某个地区，或者由于人们生活方式的改变，比如说某一地区居住的人群增多，从而增加了接触细菌或病毒的几率。 Para 1：They can be caused by several different factors, such as a virus 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 bacteria or virus. V-ing的被动式 作后置定语， 含义①virus与carry是被动关系 ②“被携带”这个动作正在进行 省略that的定语从句 prep.比如 which引导非限制性定语从句 come into contact with 接触到 Para 2： Each disease can only officially be classified as an epidemic once a certain number of deaths have occurred from the disease. The number of deaths is different for every disease. 只有致死病例达到一定数量，某种疾病才会被正式定性为流行病。每种疾病的死亡数量各不相同。 被归类为… 一旦，只有 【条件状语从句】 一定数量的 ...的数量 罕见疾病的基线很低，即使某一地区只出现少数病例，也会被认定为是流行病;与此相反，常见疾病的基线较高，如流感。普通感冒由一种广泛传播的病毒引起，可感染数百万人，但它并没严重到可以被称为流行病。 Para 2：So a very rare disease will have a low baseline and just a few cases of it in one place will be classified as an epidemic; as opposed to more common diseases, such as the flu, that have a higher baseline. The common cold is a widespread virus that affects millions of people, but it is not seen as being a serious enough condition to deserve the classification of epidemic. n.病例 adj.罕见的 n.基线 被归为…… Adj. 相反的 与此相反 定语从句 v. 值得 Para 3: With recent press reports drawing parallels between bird flu and killer epidemics of the past, Jim Smith looks at the sometimes depressing history of epidemics for clues about how we can create a more positive future without epidemics. 最近有新闻报道，吉姆·史密斯将禽流感和过去致命的流行病做对比，在屡屡令人感到沮丧的流行病史中寻找线索，从而创造一个远离流行病的美好未来。 新闻报道 draw parallels between...and...将…和…相提并论 研究 how引导的宾语从句 draw v. (1) 画,绘制(2)拉,拖(3)吸引,引起(4)获取,得出 1. （推理判断题）What can we infer from the sentence "So a very rare disease will have a low baseline and just a few cases of it in one place will be classified as an epidemic"? A. Rare diseases are more likely to be epidemics. B. Common diseases have a lower baseline. C. The baseline for an epidemic is the same for all diseases. D. Epidemics are only caused by rare diseases. 2. （词义猜测题）The word "baseline" in Paragraph 2 refers to ______. A. the number of people infected by a disease B. the number of deaths needed to classify a disease as an epidemic C. the number of countries affected by a disease D. the number of doctors treating a disease 10 $