【单选题】【消耗次数：1】
真核基因表达的调控主要是在以下几个方面，其中不恰当的是().
①
A.转录水平上的调控
②
B.mRNA加工成熟水平上的调控
③
C.翻译水平上的调控
④
D.营养和环境因素是最主要的
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