A．Almost every professor forced them to buy textbooks by themselves.
B．The books or journals they are searching for are destroyed by the flood.
C．They are too busy fighting against the flood to finish their paper.
D．Their papers are greatly damaged by the unexpected flood.

A．Books sold at the university bookstores are usually expensive,
B．It is not easy to find books on sale or at a discount.
C．College students can borrow novels from any public library in the state.
D．The college students like bargaining with the university bookstores.

A．it brings much convenience and saves a lot of time.
B．it helps to save much money for the students who are usually poor.
C．it enables the author to finish the paper in time after the flood.
D．it enables the students to keep in touch with their pals and relatives.