牺牲阳极的作用有（）。
A.防腐
B.接地
C.做参比电极
参考答案：A, B, C
委托加工应纳消费税的消费品，受托方于（）时代收代缴税款。
A.接受委托
B.加工完成
C.收取加工费用
D.委托方提货
When we were young, every evening my brother and I _____ stay at home waiting for our mother. [ ]
A. would
B. might
C. should
D. could
