A： What are the responsibilities of a tourist guide？
    B： A tourist guide must be responsible for arranging and coordinating tour activities, and offering service of transportation, accommodations, sightseeing, shopping and entertainment.
    A： Have you ever had any actual experience as a tourist guide？
    B： I have a little experience. I guided a few groups of foreign tourists around Beijing last winter vacation. I showed them to the Great Wall, the Imperial Palace, the Ming Tombs, the Temple of Heaven, and the Summer Palace.
    A： You know that it's hard work.
    B： Yes, I know. But I don't mind working hard.
    A： I'd like to ask you a few questions. Which river is the longest one in America？
    B： The Mississippi River.
    A： Can you name some large cities in the U.S.A.？
    B： New York, Washington, San Francisco, Los Angeles, Philadelphia, Boston, Houston, Chicago, only to mention a few among many.