问题
单项选择题
As an operating system repeatedly allocates and frees storage space, many physically separated unused areas appear. This phenomenon is called （）.
A．fragmentation
B．compaction
C．swapping
D．paging
答案
参考答案：A
解析：
[参考译文] 随着操作系统反复分配与释放存储空间，就会出现许多不连续的未用物理区域，这种现象称为碎片。