下列哪项凭证不能作为质押的权利凭证。（）
A、国债凭证
B、单位定期存款证实书
C、整存整取定期存单
D、定期存单
参考答案：B
All people in the company voted for Mr．Smith．His management and strong character as well as his kind-heartedness made _____ he was as CEO．
A．who
B．which
C．what
D．whom
已知直线y=2x+1和另一直线y=-3x+5交于点P，则点P关于x轴的对称点P′的坐标为______．
