It really puzzles me that sometimes my parents encourage me _____ some friends and discourage me _____

with others. [ ]

A. staying with; to go

B. to stay with; from going

C. staying with; from going

D. to stay with; to go

关于B类药物不良反应的特点叙述不正确的是（）

A.与常规药理作用无关

B.可以预测

C.反应的发生与剂量无关

D.发生率较低

E.死亡率相对较高