Now you'll hear the two long conversations.
Conversation One
W: Hey, Mike! Did you attend Mr. Johnson's seminar on the History of Chicago?
M: Yes, I did. I didn't notice you were there, too.
W: I was late for it. Wasn't it a great seminar? I have learned so much!
M: It certainly was. [19]I hadn't understood that Chicago was such a young city, less than 200 years old.
W: Yes, I thought it was an old city before, but it turned out that I was wrong. You still remember what Mr. Johnson said? The army fort, Fort Dearborn, was built in 1803 in the place that would become Chicago. Chicago didn't officially become a town until 30 years later, in 1833.
M: [20]Yes, and when it officially became a town in 1833, it was very small. It had a population of only 350. Think about that, only 350 people! It was really a tiny town by then.
W: But it's a pity that after Chicago had grown, much of it was destroyed in a fire. Just imagine! What a big fire it was!
M: [21]The Great Chicago Fire was in 1871. Chicago wasn't even forty years old at the time, but it had grown much bigger.
W: Yet only twenty-two years later, in 1893, Chicago was able to host a World's Fair. It was such a huge development for a city.
M: Yes. Chicago had been rebuilt after the fire and was eager to show itself off to the rest of the world at the World's Fair in 1893.
W: [22]I will attend another seminar on the Economy of Chicago next week. Mr. Johnson will talk about the economy specifically. Will you be there too?
M: [22]Yes, so I will see you next Thursday.

Questions 19 to 22 are based on the conversation you have just heard.
19. What had the man thought about Chicago before he attended the seminar?
正确答案：C
解析：男士说自己不知道原来芝加哥这么“年轻”。所以选C。从选项可以预测问题与“他原来的想法”有关，很有可能“他原来的想法”是不正确的。A和C意思相反，其中一个是答案。
20. What do we learn from the conversation about Chicago?
正确答案：C
解析：根据原文，芝加哥正式成为城镇的时候，人口只有350人。所以选C。从选项可以预测问题与芝加哥的情况有关。C和D选项有共同的题干，注意听原文的时候在选项旁边做简单的正误判断。
21. What do we learn about the Great Chicago Fire from the conversation?
正确答案：对话提到，芝加哥大火发生在1871年，而当时芝加哥正式成为城市还不到40年的时间。所以B正确。从选项可以预测，“It”是发生在芝加哥的一件大事。听到原文中提到数字的时候，就应该在选项旁做记录。
22. What will the two speakers do next week?
正确答案：B
解析：根据对话，男士和女士下周还要参加Mr. Johnsons的讲座，讲座的内容是“芝加哥的经济”。所以选B。从选项预测，题目是问对话的双方将要做什么事情。最后一题，往往处在对话双方的最后一个话轮。