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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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
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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