The word "levels" in the second paragraph means ______.

A．There are many kinds of amusements you can enjoy with spending no money.
B．The film shown at the local public library is often free of charge.
C．Local colleges often hold meetings to debate the issues people are interested in.
D．You should be a tourist if you want to know more about the city you live in.

A．rich or poor
B．fat and thin
C．male and female
D．handsome and ugly