The purpose of this passage is to explain ______.

A．The man finds the history course too difficult for him.
B．The man finds the history course very interesting and rewarding.
C．The man finds the history course very easy and interesting.
D．The man finds the history course interesting but demanding.

A．They expected that Internet would be socially healthier than television.
B．They expected that Internet would be more useful socially.
C．They expected that Internet would give people more information.
D．They expected that Internet would facilitate communication.