单项选择题 Suppose you have met some translation errors in the English version of public signs in tourist attractions in Xi’an, you want to carry out a thorough research on it so as to reveal the current status, analyze the causes of the existing problems in translation and provide possible solutions to improve the situation. You plan to visit more tourist attractions to collect sources for your analysis and discussion. The sources you will collect in the tourist attractions are（）。

单项选择题 Please listen to the video in the website on the issue of social media and then answer the following questions.According to what you have watched from the video, it is possible that social media is（）。

单项选择题 please listen to the video in the website on the issue of social media and then answer the following questions(2分36秒-2分49秒)The woman says that she loves social media because we are always evolving and changing, and social media helps us to（）。