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 implied in the passage that the .babies at the day-care center ______.

A．were born of. mothers with higher IQs
B．were more closely attended to by their mothers
C．were reared under a more favorable environment
D．were given more medical care than those at home