Social change is more likely to occur in societies where there is mixture of different kin
Within a society, social change is also likely to occur more frequently and more readily in the material aspects of the culture than in the non-material, for example, in technology rather than in values; in what has been learned later in life rather than what was learned early; in the less basic and less emotional aspects of society than in their opposites; in the simple elements rather than in the complex ones ;in form. rather than in substance; and in elements that are acceptable to the culture rather than in strange elements.
Furthermore, social change is easier if it is gradual. For example, it comes more readily in human relations on a continuous scale rather than one with sharp dichotomies(一分为二). This is one reason why change has not come more quickly to Black Americans as compared to other American minorities, because of the sharp difference, in appearance between them and their white counterparts.
The passage mainly discuss ______.
A.two different societies
B.the necessity of social change
C.certain factors that determine the ease with which social changes occur
D.certain factors that promote social change