题目

At the Santos family’s apartment in Sao Paulo, Brazil, the doorbell is constantly ringing. All the friends and neighbors are there to hear what happened to two-year-old Carmelita. Her mother has tears in her eyes, but they are tears of relief, of thankfulness. Her Carmelita is smiling shyly, safe in her father’s lap.The story could easily have ended very differently, not so happily. It all started this morning just before noon. Mrs. Santos was returning from the supermarket with her daughter and a friend, their neighbor. They stopped on the stairway of their building at their fifth-floor a现有某种产品100件，其中4件是次品，从中任意抽出一个件，恰好抽到次品的概率是（　　）A．1100B．150C．125D．14