下面是关于CPU与主存储器之间的cache的叙述，其中正确的是( )。
A．cache中存放的只是主存储器中部分内容的映像
B．cache的工作方式可以根据需要由软件进行设置
C．cache与主存储器是两个各自独立的存储部件，可以选择使用其中的一个
D．cache通常是由DRAM制作的
参考答案：A
解析：cache中存放的只是主存储器中部分内容的映像，其他三种说法均不正确。
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