单选
● 以下关于CPU 与主存之间增加高速缓存（Cache）的叙述中，错误的是 （4） 。
（4）
- A. Cache扩充了主存储器的容量
- B. Cache可以降低由于CPU 与主存之间的速度差异造成的系统性能影响
- C. Cache的有效性是利用了对主存储器访问的局部性特征
- D. Cache中通常保存着主存储器中部分内容的一份副本
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