Final answer:
Franklin D. Roosevelt's tone in the "Day of Infamy" speech was somber and grave, reflecting the seriousness of the Pearl Harbor attack and the resolution towards war. A reader would likely convey this gravity and resolve when recounting the speech.
Step-by-step explanation:
The tone used by Franklin D. Roosevelt during his "Day of Infamy" speech was likely very serious, somber, and determined. He was addressing Congress after a surprise attack on the U.S. which brought the nation directly into World War II. When delivering this speech, one would use a tone that conveys the gravity of the situation—an attack that resulted in significant loss of life—and a resolve to take decisive action. The use of phrases such as "a date which will live in infamy" and the characterization of the attack as "unprovoked and dastardly" indicate Roosevelt's intent to unite the nation against a common enemy and to justify the call for a declaration of war. Therefore, one would read the passage with a solemn tone that reflects both the shock of the events and the urgency of the response.