单选题 His sincerity added much more credibility to the words.
【正确答案】 B
【答案解析】[解析] 本句意思:他的真诚增加了他所说内容的可信度。sincerity意为“诚恳,真诚”,与honesty(真诚,诚实)意思相近。authority权力,权威;power权力,力量;passion热情。