The book is of great value. ________ can be enjoyed unless you digest it.
A.Nothing
B.Something
C.Everything
D.Anything
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A解析根据unless you digest it“除非你理解它”这一让步状语从句可知，“没有东西能够被你欣赏到”。所以选Nothing这一不定代词，故选A项。
点评：该题考查不定代词，难度适中。考生应首先理清nothing, something, everything, anything这四个不定代词的具体含义，再据题目的语境进行具体分析，作出选择。