It can be concluded from the passage that when all the people to be interviewed are located in a relatively big geographical are

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问题 It can be concluded from the passage that when all the people to be interviewed are located in a relatively big geographical area ______.
Sometimes a researcher cannot get valid results because ______.

选项 A、the information needed is too complex to be gathered
B、personal interviewing is the most accurate of all survey research techniques
C、personal interviewing is not as effective as other research techniques
D、both interviewer and interviewee may make mistakes during the interviewing

答案D

解析 第2段后半部分讲到interviewer可能给出不正确回答,interviewer也可能遗漏信息,故选D。
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