A.By land and labor.
B.Through social links.
C.By mutual aid.
D.By many other occasions.
A.People of all ages and both genders have to do manufacturing work.
B.People of all ages and both genders have to do the same work.
C.People of different ages and genders are assigned different jobs.
D.People of a particular age and gender are not specialized in the technical knowledge of other groups.
A.In nonindustral societies, there is not any kind of specialization of technology.
B.In nonindustrial societies, technology is not as specialized as it is in industrial society.
C.In industrial societies, women do different jobs before and after marriage.
D.In industrial societies, people are more easily adapted to certain technical field.
A.certain raw materials are available
B.everyone can do eraftwork
C.it boosts trade among villages
D.it prevents intervillage conflicts