铜器与醋不宜长久接触,否则会产生(),用生有铜绿的铜器盛放食物或烹炒菜肴易中毒。
参考答案:铜绿
He said that he had met her two years _______.
A.before
B.ago
C.for 2 years
D.since 2 years ago
厅内营业人员应适时的向客户()、()。