在控制条件下,研究因果关系的学前家庭教育研究方法称为( )。
A.调查法
B.观察法
C.实验法
D.历史法
正确答案是C
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Complete each of the following sentences with a (compound) word derived from the one(s) given in the brackets.
“Hi” is a(n) ( )way of greeting people. (formal)
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