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Unit 1 Great scientistFind out the main idea of each paragraph:(choose the right answer)Para.1 Para.2 Para.36 Para.7 A. John Snow defeated the cholera.B. John Snow wanted to solve the cholera problem.C. He tried to seek evidence and proved his theory.D. John Snow made a guess about the cause of the cholera.The main idea of the passage:The main idea of this passage is that John Snow found out the of the disease called which was a deadly disease in London in the century. With Snows great efforts, the disease was finally under .