简述病人自控镇痛
参考答案：病人自控镇痛是用计算机化的注射泵，经由静脉、皮下或椎管内输注药物，以连续性输注止痛药，并且病人可自行间歇性给药。
短文填空。
Most of the pandas are living in the __________ . [ ]
A. nature Reserves
B. Nature Reserves
C. nature reserves
se boy. I’m twelve. My school is No. 5 Middle School. I’m in C__ 2 ___ 2, Grade 1. That woman is Mrs. Brown. She is an English t__ 3___. That girl is her daughter, Liz. They are from England. Liz and I a__ 4 ___ in the same class, We are good f__ 5 ___. 