Interest is as to learning as the ability to understand,even more so.
A. vital
B. available
C. specific
D. similar
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(答案→)A. vital
B. available
C. specific
D. similar
解析：句意：兴趣与理解的能力一样重要甚至可能超过它。vital重要的；available可利用的； specific 特殊的； similar相似的。根据句意故选A。