A．The behavioral patterns of children at different time.
B．The influence of environment on a child's behavior.
C．The impact of observation on a child's behavior
D．The interactive influence of children's behavior.
A．Ignore the presentation．
B．Divide the assignment.
C．Omit some chapters.
D．Listen more carefully．
A．To attend the orientation.
B．To meet his professor．
C．To find some books.
D．To use the computer.