问题补充：
--- What is your favourite sport?
--- Swimming, I think. It’s of all.
A. earsier
B. more difficult
C. the most interesting
D. the most boring
答案：
A. earsier
B. more difficult
(答案→)C. the most interesting
D. the most boring
解析：根据of all在所有中,可知应用最高级boring无聊的与题意不符,故选C,最有趣的.
