the second period of this unit. this period focuses on the reading passage, which is about john snow and king cholera. have a good understanding of the text by doing the exercises. get the students to learn different reading skills, especially gist reading and comprehending beyond lines. knowledge aim have a good understanding of the text through the exercises. ability aims grasp some reading skills. develop the ability to describe some famous scientists. emotional aims encourage the students to work hard at their lessons in order to devote themselves to science.