细胞作为一切生物有机体构造的发育的基本单位，其结构中并不是所有生物细胞都包括的是（）
A．细胞壁
B．细胞膜
C．细胞质
D．细胞核
参考答案：A
Nature is at its most beautiful in spring ______ all kinds of flowers are in blossom, ______ attracts people from all walks of life to take a spring outing.
A．that; which
B．which; where
C．when; that
D．when; which
WinDows Server 2003采用了活动目录(A Ctive Dire Ctory)对网络资源进行管理，活动目录需安装在______分区。
A．FAT 16 B．FAT32 C．ext2 D．NTFS
