【单选题】听力原文:W: You took an optional course this semester, didn't you? How is it going? M: Terrible! It seems like the more the professor talks, the less I understand. How did the man feel about the course?
【判断题】Thinking Cap Corp. prices its various cap designs at different price levels, ranging from $2.05 to $5.95. This is an example of optional product pricing.