___ by thick bamboo and high forest, the ancient city hadn’t been discovered until the 1990s.

A．Surrounding

B．Surround

C．Surrounded

D．Having surrounded

在医嘱书写中，选药、剂量、剂型、途径等方面发生差错属于（）

A．处方差错

B．抄写差错

C．配方差错

D．给药差错

E．监测差错