教师将在幼儿园现有的两个小班开展教育改革实验研究。指定小一班为实验班,小二班为对照班,并对教师、教材两个可能影响研究结论的无关变量进行控制。其性质属于( )
A.前实验
B.后实验
C.真实验
D.准实验
正确答案是D
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