在控制实验中,要使各组被试对象的个别差异对实验效果的影响互相抵消,对这些对象的分组应该采用( )
A.平衡分组
B.结构分组
C.随机分组
D.恒定分组
正确答案是C
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WRITING
Write a composition on the ANSWER SHEET in about 150 words, basing yourself on one of the texts you have learned.
TOPIC: Compare the differences between Russell and his sister Doris when they were children. Base your com