属于自身免疫性结缔组织病的是（）
A.脂膜炎
B.硬皮病
C.红斑狼疮
D.皮肌炎
E.银屑病
参考答案：D
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
薯类含有丰富的（）
A、淀粉
B、水
C、膳食纤维
D、矿物质
