Unit 9 Human Biology Lesson 3 Epidemics Explained 课文详解课件-2023-2024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 Eqidemics Explained What do you know about epidemics? Tick () the statements that you think are correct. An epidemic is the rapid spread of an infectious disease. An epidemic can affect a large number of people in a given population. An epidemic can occur within a short period of time, usually two weeks or less. 导 传染病 大量的 特定人群 2 What do you know about epidemics? Tick () the statements that you think are correct. 导 大洲 An epidemic may spread to several countries or continents. Some common viruses, such as the common cold, are not epidemics. A new epidemic can be a different variation of a virus that people caught in the past. 3 思 1. What method is used to illustrate(说明) epidemics? A.By giving definition B.By comparison C.By examples D.By numbers 2. Which of the following statements is right about an epidemic? A. A disease which causes deaths can be classified as an epidemic. B. A disease which spreads rapidly can be classified as an epidemic. C. Epidemics have been happening for as long as there have been people living on earth. D. Epidemics can only be caused by a virus or bacteria. 4 思 3.True or False①The more people live in an area, the more chances they have to come into contact with a virus or bacteria. ( )② A very rare disease will have the same baseline as a common disease. ( )③The common cold is a widespread virus, and it has a low baseline as an epidemic. ( ) ④The Black Death first happened in Europe, reappeared in Asia. ( ) T F F T 5 思 ⑤The bird flu first appeared in 1918. ( ) ⑥The Black Death first happened in Europe, reappeared in Asia. ( ) ⑦The Great Flu struck Europe before World War Ӏ. ( ) ⑧The World War Ӏ caused more death than The Spanish Flu . ( ) ⑨The SARS epidemic first appeared in Canada and spread to Vietnam and Singapore. ( ) F T F F F 6 ①An epidemic is the name (given to an infectious disease) that rapidly spreads to a large number of people