During the summer holidays there will be a revised (修改过的) schedule (时刻表) of services for the students. Changes for dining-room and library service hours and for bus schedules will be posted  on the wall outside of the dining-hall . Weekly film and concert schedules, which are being arranged(安排)，will be posted each Wednesday outside of the student club.
In the summer holidays, buses going to the town center will leave the main hall every half hour during the day. The dinning-room will serve three meals a day from 7:00 a.m. to 7:00 p.m. during the week and two meals from noon  to 7:00 p.m. on weekends. The library will continue its usual hours during the week, but have shorter hours on Saturdays and Sundays. The weekend hours are from noon to 5:00 p.m.
All students who want to use the library borrowing services must have a new summer card. This announcement will also appear in the next week’s student newspaper.
The main purpose of this announcement is to______.

A．tell students of important schedule changes

B．tell students of new bus and library services

C．show the excellent services for students

D．ask students to renew their library cards

At which of the following times will the bus leave the main hall?

A．8:00, 9:00, 10:00, 11:00	B．8:30, 9:30, 10:30, 11:30
C．8:30, 9:00, 9:30; 10:00	D．8:00, 9:30, 11:00, 12:30

Times for films and concerts are not listed in this announcement because______.

A．they are not to be announced	B．they are hard to arrange
C．the full list is not ready	D．the full list is too long

In the summer holidays, the library will have______.

A．no special hours

B．special hours on weekdays

C．special hours on weekends

D．special hours both on weekdays and weekends