(
课件网) Unit 9 Human Biology Lesson 3 Epidemics Explained By the end of this period, you will be able to: read and talk about diseases; make and confirm guesses based on a general understanding; express and discuss ideas in a group setting; search online for information and present findings to the class. Learning objectives What do you know about epidemics Pre-reading 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. □ 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. Ⅰ. What does the passage mainly tell us A．The history of epidemics. B．How to prevent epidemics. C．What an epidemic is. D．The causes，influence and prevention of epidemics. √ Activity 1 Fast-reading for basic information While-reading Ⅱ. Match the main idea with each part. Part 1 (Para.1) A．The ways to solve epidemics. Part 2 (Para.2) B．The epidemics in history. Part 3 (Paras.3－8) C．The criteria of judging an epidemic. Part 4 (Para.9) D．The definition of an epidemic. Ⅰ.Read Para.1 and do the following exercises. 1．Fill in the blanks. An epidemic is the name given to an _____ that rapidly spreads to _____ people within a _____ period of time—usually _____ or less. 2．What may cause epidemics They can be caused by a virus being carried into an area，or changes in the way people live. infectious disease a large number of short two weeks Activity 2 Careful-reading for details Ⅱ.Read Para.2 and do the following exercise. Which of the following is TRUE about an epidemic A．A large number of people must have died from it. B．A rare disease which caused only few deaths can’t be called an epidemic. C．A common cold isn’t usually seen as an epidemic. D．Whether a disease can be classified as an epidemic depends on its spreading speed. √ Ⅲ.Read Paras.3－8 and do the following exercises. 1．Why do people fear bird flu could be the next global epidemic A．Because bird flu has caused thousands of deaths. B．Because bird flu has influenced countries all over the world. C．Because scientists have proved it after studying tissue samples. D．Because people have found the links between bird flu and the 1918 Spanish Flu. √ 2．What is the similarity between “The Black Death” and the Great Flu Epidemic A．They both lasted about one year and a half. B．They both caused more than 50 million deaths. C．They had similar visible symptoms. D．They both had a terrible effect on Europe. 3．Which is TRUE about the Spanish Flu A．It led to the end of World War Ⅰ. B．It was spread quickly because of the war. C．It isn’t a threat since 1918 any longer. D ... ...
