单选题 At the______of his power, Powhatan ruled so many Algonquian tribes that he needed eight interpreters just to converse with members of his own affiliated tribes.
【正确答案】 D
【答案解析】解析：本题考查名词词义辨析。根据空后的“波瓦坦统治很多阿尔冈部落”推断，应该是在他权力的鼎盛时期，故答案为zenith(鼎盛时期，顶峰)。ascent意为“上升，攀登”；fatigue意为“疲劳，劳累”；sphere意为“范围，领域”。