The question asks about what you read in the passage “Trouble Brews” and the excerpt from “Men and Machines, World War I.” Which is a primary difference between the excerpt and the passage? Responses “Men and Machines, World War I” focuses on the invention of airplanes, while “Trouble Brews” focuses on the early aviators who improved upon the technology. “Men and Machines, World War I” focuses on the invention of airplanes, while “Trouble Brews” focuses on the early aviators who improved upon the technology. “Men and Machines, World War I” focuses on the camaraderie that pilots have during war, while “Trouble Brews” focuses on fighting and competition between pilots. “Men and Machines, World War I” focuses on the camaraderie that pilots have during war, while “Trouble Brews” focuses on fighting and competition between pilots. “Men and Machines, World War I” focuses on information about famous aviators and early airplane models, while “Trouble Brews” focuses on the experiences and difficulties of early aviation. “Men and Machines, World War I” focuses on information about famous aviators and early airplane models, while “Trouble Brews” focuses on the experiences and difficulties of early aviation. “Men and Machines, World War I” focuses on a description of pilots’ motivations for joining the war effort, while “Trouble Brews” focuses on the skills that early aviators honed through flying in the war. “Men and Machines, World War I” focuses on a description of pilots’ motivations for joining the war effort, while “Trouble Brews” focuses on the skills that early aviators honed through flying in the war.