According to the passage, the language of primitive cultures was ______.

A．primitive language may be large, complex, and complicated
B．primitive language may be large, complex, and logical
C．primitive language may be large, old, and logical
D．primitive language may be similar to pidgin English

A．although rats are affected by overcrowding, people are not
B．data from experiments indicate that overcrowding may be an important cause of social pathology
C．the social behavior of rats is seriously affected by overcrowding
D．Calhoun' s experiments have influenced many people