单项选择题
A．The number of households surveyed is not very large.B．The survey was not carried out by the research team.C．There is no sample from the districts of Ireland.D．The findings are interesting but not academically useful.
A．结构性访谈和非结构性访谈B．一次性访谈和重复性访谈C．个别访谈和集体访谈D．试测与正式访谈