食品大肠菌群阳性可推断该食品可能污染（）
A.溶血性链球菌
B.金黄色葡萄球菌
C.变形杆菌
D.蜡样芽孢杆菌
E.铜绿假单胞菌
参考答案：C
The woman asked the policeman where ________. [ ]
A. the post office is
B. the post office was
C. is the post office
D. was the post office
主基准、副基准和工作基准都必须经国家批准。( )
