【正确答案】 A

【答案解析】[解析] 原文最后一句话说“the young males stay with their mothers for a time．Then they must leave the family”(小雄象可以和妈妈呆一段时间，但之后必须离开家)。答案[B]“the moment they are born”(出生时)， [C]“when they are old” (年老时)都不对，只有[A]“sometime after they are born”(出生一段时间后)与原文一致。