First impressions are the most lasting. After all, you never get _____ second chance to make _____ first

impression.[ ]

A. a; the

B. the; the

C. a; a

D. the; a

在拆除作业中发现不明物体，应停止施工，采取相应的应急措施，保护现场并应及时向有关部门报告。