某病在某地区显著超过该病历年发病率水平,称为
A.散发
B.暴发
C.流行
D.大流行
E.大暴发
参考答案:C
(2012·杭州高二检测) Next door to ours _______, who has just returned from abroad.
A.where lives an old man
B.where does the old man live
C.lives an old man
D.does an old man live
货币成为交易的媒介,提高了交易效率,降低了交易成本。