问题补充：
---- What do you think of zoology?
---- In my opinion, zoology is botany.
A. a subject so interesting as
B. as a interesting subject as
C. as interesting a subject as
D. interesting as a subject as
答案：
A. a subject so interesting as
B. as a interesting subject as
(答案→)C. as interesting a subject as
D. interesting as a subject as
解析： 考查as…as结构。正确顺序应是as+adj.+(a/an)+n.+as。所以选C。
