learning aims: 1. develop reading ability and learn different reading skills. 2. know more about contributions of scientists and the way to organize scientific research. important point and difficult point: develop reading ability and learn different reading skills. 《使用说明及学法指导》预习新单词、泛读书上p2课文，完成预习案。(25mins) 预习案previewing case task 1 skimming 1 .what's the general idea of the text? ( ) a. to show us how difficult it was to find a cure for cholera. b. to tell us how john snow found the cause of cholera and the cure for it. c. to show us how difficult it was to carry out experiments at that time.
