术后镇痛目前最好的止痛方法是：（）。
A.肌肉注射
B.神经阻滞
C.舌下含服
D.PCA
E.透皮吸收
参考答案：D
—Why didn't you arrive there until three days later?
—Because the heavy rain _____ the difficulties of the journey. [ ]
A. added
B. added to
C. was added
D. was added to
“兴尽晚回舟，误入藕花深处“的后一句是（）
A.争渡，争渡，惊起一滩鸥鹭
B.知否？知否？应是绿肥红瘦
C.归去，归去，江上一犁春雨
D.依旧，依旧，人与绿杨俱瘦
