单选题 His emotional problems ______ from his experiences as a child, I think.

【正确答案】 A

【答案解析】[分析] 词义辨析。 A．stem滋生，阻止；起源，发生；B．flourish茂盛，繁荣，处于活跃/旺盛时期；C．root生根，固定，根源在于(in)；D．sprout萌芽；所以答案为A。