商周时期的青铜日用器，常被用作祭祀和（）的礼器，故称为青铜礼器。
A.欢庆
B.典礼
C.迎驾
D.嫁娶
参考答案：B
— Is this the first time you ______ Chengdu ?
— No. But the first time I ______ here, the city wasn't so beautiful. [ ]
A. visited; came
B. visited; have come
C. have visited; have come
D. have visited; came
《招标投标法实施条例》规定，资格预审文件发售期不得少于( )个工作日。
A．10 B．8C．7 D．5
