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
From the first sentence we learn that researchers ______.
A．have increased the risks to child growth by manipulating the natural environment
B．are increasingly aware of the effects of environmental factors on intelligence development
C．are increasingly interested in figuring Out how intelligence is developed in early child- hood
D．are increasingly interested in manipulating the environment without being aware Of the risks involved to children
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