职业道德是一种（）的约束机制。
A.非强制性
B.外在性
C.自发性
D.随意性
参考答案：A
—Look! It's raining heavily. take a raincoat with you?
—Well, I'll take one right now. [ ]
A. Why not
B. Why don't
C. Would you mind
D. Would you like
套期图利又称差价交易，套利交易，它可分为（）。
A.跨月套期图利
B.跨商品套期图利
C.跨公司套期图利
D.跨市场套期图利
