单选题 Nxele denounced sorcery, adultery, ______, incest, extortion, and murder; he would not eat prepared food, which he said was unclean, and stopped drinking milk.
【正确答案】 C
【答案解析】解析：C项polygamy意为“一夫多妻，一妻多夫”，根据空格处的意思“Nxele谴责巫术、通奸、多配偶、乱伦、勒索和谋杀”，故选C。A项monogamy“一夫一妻制”；B项monologue“独白，独角戏”；D项polygene“多基因”，均不符合题意。