[单项选择]Cultural norms so completely surround people, so permeate thought and action, that we never recognize the assumptions on which their lives and their sanity rest. As one observer put it, if birds were suddenly endowed with scientific curiosity they might examine many things, but the sky itself would be overlooked as a suitable subject; if fish were to become curious about the world, it would never occur to them to begin by investigating water. For birds and fish would take the sky and sea for granted, unaware of their profound influence because they comprise the medium for every fact. Human beings, in a similarly way, occupy a symbolic universe governed by codes that are unconsciously acquired and automatically employed. So much so that they rarely notice that the ways they interpret and talk about events are distinctively different from the ways people conduct their affairs in other cultures.
As long as people remain blind to the sources of their meanings, they are imprisoned with
A. show that they, too, have their respective cultures
B. explain humans occupy a symbolic universe as birds and fish occupy the sky and the sea
C. illustrate that human beings are unaware of the cultural codes governing them
D. demonstrate the similarity between man, birds, and fish in their ways of thinking