现代证券组合理论表明，可以用效用无差异曲线来刻画投资者对风险收益的偏好特征。下列能够刻画“只关心风险而无视收益的投资者”的无差异曲线是（）。

A．A

B．B

C．C

D．D

Mr. Lee          a plan to reduce water pollution, which all the people present at the meeting thought highly of.

A．put off

B．put on

C．put forward

D．put away