Many students think geography is_________ math．（ ）
A. as difficult a subject as
B. as a difficult subject as
C. the same difficult subject as
D. a subject the same difficult as
答案是A．本题考查as…as的结构．same是形容词，不修饰形容词或副词，所以排除C和D．as…as结构中，两个as之间必须是形容词或副词的原级；B项是名词短语a difficult subject，所以排除；A项中两个as之间是形容词difficult，difficult同时又修饰了名词a subject，构成了"as+adj+n+as"的结构，故答案选择A．
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