Question 19 is based on the passage you have just heard.

听力原文：

    Katherine loved Facebook. With Facebook she could stay connected with her family no matter how far away they were. She could see their photos and read their status updates. With Facebook, she could keep her relatives up-to-date on what she was doing.（19）Another thing Katherine loved about Facebook was that she didn’t have to think about time zones when updating family. Whenever she called her parents or other relatives, she always had to think about the time difference so that she wouldn’t wake someone up or call when she knew they were at church. Facebook was so convenient.

    When Katherine joined Facebook, some of her classmates at high school started to add her as a friend. At first, this didn’t bother her.（20）She loved learning about the success of people she knew when she was just a teenager. She loved finding out people were getting married, having babies, and traveling.

    （21）Soon however, Katherine found herself comparing herself with the people she was reading about on Facebook. It began to make her feel bad that some people seemed to be doing so much better than she was. She was also spending a lot of time on Facebook. It took a lot of time and energy to keep up with everyone’s status updates.

    Katherine started to think. She looked at the list of over 500 friends she had on Facebook and realized some of them were not really friends at all.

19. What was one particular convenience Katherine loved about Facebook?

解析：A。本题目为细节题。问题为：关于 Facebook，Katherine 最喜欢的特别的便捷的一点是什么？原文讲述了Facebook的众多便捷之处。“Another thing Katherine loved about Facebook was that she didn’t have to think about time zones when updating family. She can stay connected with her family no matter how far away they were. ”，可见Katherine爱上Facebook的另外一个原因是当她和家人联络时，她不用考虑时区（差异）。无论相距多远，她都可以和家人保持联系。故正确答案为A）She could update her family any time she liked（在任何时候，她都可以和家人了解彼此的最新消息）。