【题目】In my view, biology is ________ chemistry, but a little easier than mathematics.
A. a subject so difficult as B. as a difficult subject as
C. difficult as a subject as D. as difficult a subject as
在线课程【答案】D
【解析】
试题分析：考查固定句型。句意：在我看来生物和化学是一样难的科目，但是比数学稍微容易些。固定结构as +形容词+a/an +单数名词 +as，表示...和...一样。故选D。