单项选择题

What's the reason for Dr. Jeol Hiderbrand's interest in chemistry

A．His chemistry teacher was a great teacher.
B．His parents taught him chemistry when he was very young.
C．He was born in a time young people had greater freedom to decide what they wanted to do.
D．His talents were greater than his chemistry teacher.

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单项选择题

The data accumulated was obtained through

A．observation by social psychologists.
B．conversations with mothers of the children.
C．interviews, school records and physician' reports.
D．observations of fathers with their children.

单项选择题

According to the passage, children who tended to generally progress academically were

A．those whose mothers gave them the most affection.
B．those whose fathers worked the night shift.
C．those who had no brothers or sisters.
D．from one-parent families.