答案：C
流行病学研究的用途是（）
A.探索病因及影响因素
B.评价预防策略和措施的效果
C.疾病监测
D.研究疾病的自然史
E.以上都对
The goods which have entered the territory, approved by the Customs as items for which no formalities are performed in the way of duty payment, and will be reshipped out of the territory after being stored, processed or assembled in the territory are defined, as ______.
A. bonded goods B. through goodsC. transshipment goods D. transit goods
