Level 4Unit 1Part 1 Listening克里斯蒂娜有两周的假期。这是她很久以来的第一个假期。她上一次休假是在两年多以前。现在她正在旧金山拜访一位朋友。她的朋友和她的丈夫住在市中心附近。他在硅谷的一家初创公司工作。他工作时，她在一家百货公司做兼职。Christina is on a two week vocation. This is the first vocation she has had for a long time. The last vocation she took was more than two years ago. Now she is visiting a friend in San Francisco. Her friend and her husband are living near the center of the city. He works for a start-up company in Silicon Valley. While he is working, s
