单选题 It comes as no surprise that societies have codes of behavior. The character of the codes, on the other hand ,can often be ______.
A. predictable B. unexpected C. explicit D. confusing

【正确答案】 B
【答案解析】(unexpected无法预料的)。句意为：社会具有某些行为准则，这一点毫不奇怪，而这些准则的特征往往难以预料。A．predictable可以预料的；C．explicit不含糊的；D． confusing迷惑人的。