Read the excerpt from "Lessons of Dr. Martin Luther King, Jr." The simple act of refusing to buy table grapes laced with pesticides is a powerful statement that the growers understand. Economic pressure is the only language the growers speak, and they are beginning to listen. Please, boycott table grapes. For your safety, for the workers, and for the children, we must act together. This passage shows that one purpose of Chavez’s speech is to persuade people to stop buying grapes treated with pesticides. to tell people about the financial troubles of grape growers. to urge people to learn more about ways to protect children. to show people how growers and consumers can work together.

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)