Summarization Read each of the following short paragraphs and co

Summarization Read each of the following short paragraphs and complete the phrase or sentence that expresses the main idea of the paragraph. The first letter of the missing word is given be fore the blank. 4. A long time ago man believed that evil spirits caused diseases. But now thanks to the advance of science and the invention of scientific instruments man knows that diseases are caused by bacteria and virus and knows also how to prevent and cure these diseases. Science and technology help us understand d______.
【正确答案】：diseases
【题目解析】：P51