阻断纹状体的胆碱受体
A．左旋多 B．金刚烷胺 C．苯海索 D．溴隐亭 E．卡比多巴
参考答案：C
小儿视觉发育正常，可区别各种颜色的年龄是（）
A.3岁
B.4岁
C.5岁
D.6岁
E.7岁
They took a hell of a risk and suffered a great deal but it______.
A．paid back
B．paid up
C．paid off
D．paid down
