As a role model, I don’t think most people can imagine what it’s like ____that close every minute of the day. 

A．to be watched

B．watched

C．watching

D．to watch

α-猪去氧胆酸具有

A．松弛平滑肌作用
B．溶解胆结石作用
C．收缩平滑肌作用
D．降低血液胆固醇作用 E．强心作用