听下面一段对话,完成第1至3题。 1. When did Marco Polo leave Italy? A. In 1217. B. In 1271. C. In 1275. 2. How long did Marco Polo stay in China? A. Seventeen years. B. Fourteen years. C. Seven years. 3. When did Marco Polo arrive back in Venice? A. In 1275. B. In 1295. C. In 1271.