膳食中维生素A的来源:()
A动物肝、肾、牛奶
B粮谷类
C绿叶类
D酱菜类
E干豆、花生
参考答案:A
He has ________ all of the money and no one would like to help him.
A.used to
B.used as
C.used up
D.used for
Eudemon防火墙支持多台设备之间运行VRRP协议,但是只支持两台设备之间运行HRP协议。