Antibiotic drugs Among the hundreds of compounds produced by microorganisms that have inhibitory action on other microorganisms, only a relatively small number have a favorable therapeutic index. These are the clinically useful antibiotics. In the present discussion, particular attention will be paid to the potency, antibacterial spectrum
Unit two Section A: Environmental Protection throughout the world about the text Ecology is the study of the relationships among plants, animals, people, and their environment, and the balance among these relationships
Unit Four Section A: Five Famous Symbols of American Culture warm- up activities: 1. What are the symbols of American Culture that you have heard about? 2. What can you imagine to be the reasons why the Statue of liberty was built?
Unit six Section A How to Prepare for Earthquakes Warm-up questions 1. Have you ever been in an earthquake? 2. What do you think you would do first if the room started to shake? 3. How should we prepare for earthquakes?
