和远期相比,期货合约的差别在于( )。
A.灵活多变
B.是标准化的
C.内容可商定
D.一般在交易所交易
E.可在到期前随时平仓
参考答案:B,D,E
Holmes and Watson spent the night ___in the lady's room. [ ]
A. being locked
B. locking
C. locked
D. lock