warming up
There are some great scientific achievements that have changed the world. Can you name some of them? What kind of role do they play in the field of science? Do these achievements have anything in common?
1.John Snow Defeats “King Cholera”
大家讨论下：What should we pay attention to in our daily life in order not to get infected with cholera?
课后作业：Dictate 10 words in reading passage and 2 sentences.Finish the Exe.1 & 3 on P 3 and 1&2 on P4
