单项选择题

In the first sentence of the last paragraph, the pronoun "this" refers to （）

A．survey
B．question
C．answering
D．personal interviewing

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单项选择题

According to the last paragraph, one of the advantages of the personal interviewing is （）

A．the interviewer can ask the interviewee questions again in different ways
B．the interviewer can ask the interviewee some personal questions
C．the initial question do not produce the information desired
D．no one is present to clarify questions