单项选择题A．The chairperson elected by the members of the committee.B．One of the representatives who are in charge of the great graduation ceremony.C．The chairperson elected by the representatives of different departments,D．The person who is in charge of organizing the graduation ceremony every year.

单项选择题A．She is talking on the train.B．She is looking at a time table.C．She is looking for a map.D．She is taking a picture.