C．To notify university people of important schedule changes．
D.To remind the students to validate their identification card.
17．Specific schedule revisions for which of the following facilities are listed in this announcement？
A．Athletic and recretional．
B．Food and transportation．
C．Bookstore and post office．
D．Medical and audio-visual．
18．Times for movies and concerts are not listed in this announcement because__
A．film or concert occurs every Wednesday at 7p．m．
B．the full list would be too long
C．films and concerts cannot be announced publicly
D．the full list is not ready yet
19．Accoding to the announcement which of the following is true of special summer hours for the library？
A．It has them only on the weekends．
B．It has them both weekdays and weekends．
C．It has no special summer hours．
D.The information is not available.
20.According to the announcement，a validated identification card is required to___
A
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