单项选择题

The data accumulated was obtained through ______.

A.observation by social psychologists
B.conversations with motl3ers of the children
C.interviews, school records and physicians' reports
D.observations of fathers with their children
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单项选择题
The main discovery made in the study was that ______.
A.children in large families tend to do poorly in school
B.a father's influence played a significant factor in the level of the child's academic progress
C.mothers were subjective in evaluating the roles played by fathers
D.there is a correlation between socioeconomic status and scholastic achievement
单项选择题
All of the children studied ______.
A.attended the same school
B.were in the Same socioeconomic class
C.were at the same age
D.knew each other
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