In my view, biology is ______ chemistry, but a little easier than mathematicsA.a subject so difficult asB.as difficult a subject asC.as a difficult subject asD.difficult as a subject as
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B解析固定结构as +形容词+a\an +单数名词 +as 。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。