根据中文及首字母填写单词。

      Come and meet my family! Look! This is my m___________ (妈妈). She's a n___________ (护士).

This is my f___________ (爸爸). He's a d___________ (司机). This is my aunt. She's a t___________

(教师). This is my uncle. He's a d___________ (医生). My grandpa and grandma are f__________s (农民).

公差不为0的等差数列的第2，3，6项成等比数列，则公比为（　　）

A．3

B．1

C．3或1

D．不确定