柜员应按照（）频次，将其保管的作废重要空白凭证上缴支行库管员。
A.每天；
B.每周；
C.每月；
D.每年
参考答案：B
—How long ______ Rachel and Ross ______?
—It is fifty years since they ______. It is their gold marriage this year.[ ]
A. has; been married; marry
B. has; get married; marry
C. have; married; married
D. have; been married; married
韶山4型电力机车每台转向架有（）完全相同的轴箱独立悬挂装置。
A.二组
B.三组
C.四组
D.五组
