As life on campus is not confined to classroom, students should strive a balance between ______.

A．Notice the way the person is talking.
B．Take a good look at the person talking.
C．Mind his tone, his posture and the look in his eyes.
D．Examine the real meaning of what he says based on his manner, his tone and his posture.

A．Every 2 years.
B．Whenever one dies or must resign.
C．Every 6 years.
D．Every 4 years like the president.