此图标的意思是？

问答题Memos are an important means of stating and exchanging ideas, reacting to them, clarifying them, and finally agreeing on actions to be taken. Although the telephone is faster than the memo in communication, the memo is safer than the telephone, because very often the person who you want to reach is not there when you dial the phone number.

填空题Alphabetical classification (the basis of most system)It is simple and inexpensive to operate and most people can follow it easily. Its disadvantages are that it is cumbersome in a large system and can arise with some names. Alphabetical rules must be followed consistently when filing by name.（）

问答题There are other important files in the office. On my desk is the card file with all the telephone numbers my employer uses regularly. There is also a file box to hold all papers waiting to be filed. In my desk is the daily reading file, which is in chronological order. It contains a copy of every letter we write during the month.

单项选择题A．remembered B．forget C．remember D．was reminded

问答题此图标的意思是？