听下面的独白，回答第1-3题。 1．What should we do when we first get our mail according to the speaker? A．Open and sort the mail. B．Answer the mail right away. C．File important information. 2．How often at least does the speaker suggest that we clean out our files? A．Once a week. B．Twice a month. C．Once a year. 3．What can we learn from the talk? A．The speaker is an advisor at a high school. B．We have to give up some of our subscriptions sometimes. C．We should store something on the top of our desk for use.