Passage Two
Questions 29 to 31 are based, on the passage you have just hear.

A．to define the term social class does not involve much difficulty
B．there is much alternation in people’s social classes
C．to evaluate a person’s social class is a very complex procedure
D．we can tell which social class a person belongs to by the way he behaves

A．Just very easy.
B．Not so hard.
C．Simply a headache.
D．Impossibl