tradition是我漏看了，不过即便这样，这个答案C也是有很大问题的。

第一段中提到tradition的句子如下：其中说的loosely governed by traditions, 这个loosely和答案C中的basis是矛盾的,顶天了只能说是part of the basis。其次这个tradition也没说是social tradition，此后全文未再提tradition的事，更别说social tradition了

除非说moral code只包含dishonest and violent behaviours

Dishonest and violent behaviours were disapproved of; leadership, marriage and interactions with other groups were loosely governed by traditions

答案C：Social tradition was the basis.

【 在 tokilltime 的大作中提到: 】
: 没 楼上是真破案
: 原文就有tradition 我没认真看
: 确实选C
: ...................
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