下列属于危害公共卫生的物品为（）。
A、经过硝制的兽皮
B、经处理的骨灰
C、动物标本
D、未经药制的动物肢体
参考答案：D
— Do you know Henry didn't win that speech contest?
— _____? I thought he would. He worked so hard on it. [ ]
A. Do I
B. Don't I
C. Did he
D. Didn't he
提示小儿缺乏维生素B12的血清维生素B12值是（）
A.>100ng/L
B.<100ng/L
C.200～800ng/L
D.>200ng/L
E.>150ng/L
