It is easy to get the feeling that everyone except you is living a full, rich and busy life in

A．The History of Pop.
B．The Road to Music.
C．Pop Words.
D．About the Big Hits.

A．Animals yawn for a number of reasons.
B．Yawning results only from fatigue or boredom.
C．Human yawns are the same as those of other animals.
D．Only social animals yawn.