People live in groups,which we call societies.Societies social relations are the subjects(1)in the social sciences.
     Men depend on other men on the world around them.The sun brings them warmth (暖和,热烈) light,day night,summer winter.Plants grow (2)there is air sunshine,earth water; animals depend on plants;depend on water,air,sunshine,the plants animals around them.
     Wherever people live (3)they look like,many of their requirements are the (4).They need food places to live in warmth sleep.They need a social existence (存在,生存),they need friendship relationship (关系) which will(5)to marriage family life.The members of a society depend on one(6)B.
     In different societies we find different ways of finding food different methods of preparing it. Societies have(7) habits customs.They teach their children,care for sick people, look after(8)people in various ways.They have different in life,death the world(9) which they were born.
     Most men want  to live in peace.The members of every social group accept certain rules customs expect other members to know them. Children are taught to(10) these rules,what they do in life depends partly on the habits they learned when they were young.(10分)
1.    (A)studied    (B)searched    (C)explained    (D)learned