单项选择题

The investigation done in the IHD programs ______.

A．focused on children from poor families
B．was less convincing than Ramey's research
C．confirmed the findings made in Ramey's research
D．focused on the intelligence growth of children with low IQs
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单项选择题
The finding that children reared at home had low IQs at age 12 indicates ______.
A．educational day-care centers are the best place for children to grow up in
B．parents fail to provide an adequate environment for their intelligence growth
C．the age of 12 is a critical point in time for intellectual development in children
D．intellectual development and academic achievement of children are closely related
单项选择题
It is clear from the passage that the author advocates ______.
A．the natural development of children's intelligence
B．early intervention in children's intellectual growth
C．providing enough day-care centers for children of working mothers
D．depriving poor mothers of the opportunities to raise their children at home
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