期货投机者在期货市场上进行投机交易的目的是( )。
A．获得无风险利润B．获得价差收益C．规避现货市场的风险D．规避期货市场的风险
参考答案：B
两圆的半径分别为4cm和2cm，圆心距是5cm，则两圆的位置关系是______．
I think nobody makes _______ contributions to the company than him.
A．greater
B．more great
C．more greater
D．much great
