– What do you think of teaching, Bob?

-- I find it fun and challenging. It is a job ________ you are doing something serious but interesting.

A．that

B．which

C．when

D．where

根据以往一定时期内各个年龄人的死亡统计资料编制的统计表是（）。

A．生命表

B．调查表

C．抽样表

D．测算表