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. She loved learning about the success of people she knew when she was just a teenager. [20]She loved finding out people were getting married, having babies, and traveling.
    Soon however, Katherine found herself comparing herself with the people she was reading about on Facebook. [21]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 of Facebook?
20. How did Katherine feel when her classmates added her as a Facebook friend?
21. What made Katherine feel bad about herself later on?

解析：题目问的是 Katherine 喜欢脸书带来的方便是什么。录音提到，Katherine 喜欢脸书的另一个原因是，在脸书上更新近况，与家人沟通时不用再顾忌时区，A“她可以 随时与家人沟通”与录音表述的意思一致，故选 A。

题目问的是当 Katherine 的朋友在脸 书上加她的好友时，Katherine 有何感想。录音提到，Katherine 喜欢得知朋友的近况。如结 婚、生小孩和旅游，B“她喜欢阅读朋友的动态更新”与录音表述一致，故选 B。

录音问为什么到后面 Katherine 对自 己感到沮丧。录音提到。Katherine 开始将自己与脸书上的好友作比较，发现部分人比她成 功太多，这让她感觉很糟糕，D“她似乎不像脸书上的好友做得一样好”符合录音所述，故 选 D。