单选题 In his two-hour-long lecture he made an exhaustive analysis of the issue.
A. extremely thorough B long and boring C. superficial D. unconvincing

【正确答案】 A

【答案解析】[解析] exhaustive是“透彻的；彻底的”的意思，如：exhaustive study透彻的研究，exhaustive investigation深入的调查，所以extremely thorough是正确答案。long and boring：长得令人厌倦。superficial：表面的。unconvincing：不能使人信服的。这三个选项均不合适。