以下不是内分泌系统固有的内分泌腺的是（）
A.甲状腺
B.垂体
C.胸腺
D.肾上腺
E.性腺
参考答案：C
--- Mum, where is my toy cowboy? I________it under the bed.
--- It_____inside your toy bucket. Remember, that’s where all your toys are supposed to go.
A．have put; is
B．put; is
C．have put; was
D．put; was
一个计算机网络由______组成。
A．传输介质和通信设备
B．通信子网和资源子网
C．用户计算机终端
D．主机和通信处理机
