用药安全性的确切含义是
A．无毒副作用
B．不良反应轻微
C．不良反应发生率低
D．风险/效益尽可能小
E．可以耐受
参考答案：D
It's freezing outside. You _______ put on your overcoat. [ ]
A. had better to
B. had better
C. would better
D. would better to
组织
eezing outside. You _______ put on your overcoat. [ ]