单项选择题
玉米螟只危害玉米。( ) A. 对 B. 错
玉米螟只危害玉米。( ) A. 对 B. 错
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多项选择题
Which are the methods of interview investigation? ()
Which are the methods of interview investigation? ()
A.Face-to-face interview
B.Questionnaire investigation
C.Informal discussion
D.Telephone interview