engineering achievements to date and the prospective benefits and latent perils. The author holds that what the researchers are plotting is not only a revolution in biology but also in society. The whole passage may be divided into 4 parts. Look at the following chart and you'll find:The first part of the passage is made up of the first 3 paragraphs, and is a general description of the appearance of DNA and its potential function.
The second part is made up of 4 paragraphs, from Paragraph 4 to Paragraph 7. This part tells the significance of DNA research and how it is to be applied in medical treatment.
The third part consists of Paragraph 8 and Paragraph 9, which gives an account of the dilemma and danger currently posed by the genetic revolution and scientists' worries about the misuse of DNA information.
The last part consists of the last 2 paragraphs of the text, i.e. Paragraph 10 and Paragraph 11. This part brings forward people's different opinions of DNA research.
