【单选题】
A、The five questions were not well designeD、
B.Not all the questionnaires were returneD、
C.Only a small number of students were surveyeD、
D.Some of the answers to the questionnaire were not valiD、
网考网参考答案:C
网考网解析:
[听力原文]
Why is it difficult to reach any definite conclusions from the survey
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