___ youngest though she is, she is ____ wisest.
A.the; the
B./; /
C./; the
D.The; /
答案:C
高水平学生在测验中能得高分,而低水平学生只能得低分,说明该测验下列哪种质量指标高?()
A.效度
B.信度
C.区分度
D.难度
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