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
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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
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