食品添加剂安全性评价指标包括（）？
A.半致死剂量LD50
B.最大使用限量mg/kg
C.每日允许摄入估计值ADI
D.许可使用范围
参考答案：A, C
Tom _____his father.They are both clever and a bit quiet. [ ]
A. looks after
B. take after
C. follows
D. takes after
阴阳之“征兆”是
A．内与外
B．明与暗
C．上与下
D．水与火
