【单选题】【消耗次数：1】
存储器分为内存储器和外存储器两类，下列哪种说法正确？
①
它们中的数据均可被CPU直接调用
②
其中只有外存储器中的数据可被CPU直接调用
③
它们中的数据均不能被CPU直接调用
④
其中只有内存储器中的数据可被CPU直接调用
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