问题补充：
－Many boy students think math is English.
－I agree. I’m weak in English.
A. much difficult than
B. so difficult as
C. less difficult than
D. more difficult than
答案：
A. much difficult than
B. so difficult as
(答案→)C. less difficult than
D. more difficult than
解析：so……as前面用否定形式，表示不如……，用于同级比较；less……than表示不如……，more……than比……更……，用于两者之间进行比较。句意：许多男生认为数学不如英语难。——我同意。我英语不行。结合语境可知选C。
