下列抗寄生虫药物，按照药物妊娠毒性分级，属于B类的药物是（）
A.甲硝唑
B.甲紫
C.奎宁
D.甲苯达唑
E.氯喹
参考答案：A
—Have you heard about that fire in the market?
— Yes, fortunately no one _____.
A．hurt
B．was hurt
C．has hurt
D．had been hurt
过滤器压力损失大于（）KPa时应拆下清洗。
A.12
B.15
C.10
D.8
