题目内容：
根据下面资料，回答题 People five in groups, which we call societies, and social relations are the subjects （41） inthe social sciences.
Men depend on other men and on the world around them. The sun brings them warmth andfight, day and night, summer and winter. Plants grow （42） there is air and sunshine, earth andwater, animals depend on plants; men depend on water, air, sunshine, and the plants, animalsaround them.
Wherever people live and （43） they look like, many of their requirements are the （44）They need food and places to five in warmth and sleep. They need a social existence, they needfriendships and relationships which will （45） to marriage and family. The members of a societydepend on one （46）
In different society we find different ways of getting food and different methods of preparingit. Societies have （47） habits and customs. They teach their children, care for sick people, lookafter （48） people in various ways. They have different beliefs in fife, death, and the world（49） which they were born.
Most men want to live in peace. The members of every social group accept certain rules andcustoms and expect other members to know them. Children are taught to （50） these rules, andwhat they do in later life depends partly on the habits they learned when they were young.
第（41）题选 A．studied
B．searched
C．explained
D．learned
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答案解析：