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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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
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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