I always studied and was prepared to give any and every part for every meeting. I was actually always "on call" to give a last minute Sunday public talk if needed. (Only once did I have to; got called Saturday 9:30 PM and was asked to give a talk the next morning).
Most of the time what would happen was, the conductor would ask the quesiton, I'd answer in my own words, then he wouldn't realize I answered the question. So he'd be asking the audience, "And what does the paragraph bring out about...?" Then someone would read it word for word. Then others would start saying, "That's what [snakeface] said." And the conductor would say, "Oh, I didn't know that's what he meant." So in other words, the conductor was looking for an answer in the exact wording found in the paragraph. If you worded it differently he was not intelligent enough to understand the comment. Which, in turn, proves that he himslef had not prepared the lesson. He should he first learned the material, but instead he must have had his kids underline the answers so that on the platform he'd compare the comments with the underlined answers.