单项选择题
单项选择题 Which of the following is the main idea of this passage
问答题 Microblogging, and other forms of social media, have had an impact as profound as the printing press. The printing press changed distribution of, and access to, information for all time, giving widespread access to information that was previously unavailable to the majority of the population.
单项选择题 We know from the passage that ( ).