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  3. Researchers are increasingly interested in manipulating the environment early in children’s lives when they are perceived to be

Researchers are increasingly interested in manipulating the environment early in children’s lives when they are perceived to be

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问题     Researchers are increasingly interested in manipulating the environment early in children’s lives when they are perceived to be at risk for impoverished intelligence. In a program conducted in North Carolina by Craig Ramey and his associates, pregnant women with IQs averaging 80 were recruited for a study. After their babies were born,half of the infants were cared for during the day at an educational daycare center and half were reared at home by their mothers; both groups of children were given medical care and dietary supplements, and their families were given social services if they requested them.
    At the age of 3, the children who attended the educational daycare center had significantly higher IQs than did the home-reared children. This difference was likely due to the decline in the IQs of the home-reared children during the period from 12 to 18 months of age. By the time the children were 5 years old, 39 percent of the home-reared children had IQs below 85 but only 11 percent of the educational day-care children had IQs this low. In the most recent evaluation of this project, positive effects of educational daycare on the intellectual development and academic achievement of the children were evident at age 12.
    Some parents, such as those in Ramey’s study, have difficulty providing an adequate environment for the intellectual needs of their infants. Once these difficulties are a reoccurring part of the family system, changing efforts probably will be more difficult and costly; early intervention in the family system is directed at changing parental adaptive and responsive functioning so that permanent negative effects are minimized.
    In another investigation, the Infant Health and Development Program, early intervention with low-birth weight children revealed that both home visitation and an educational child curriculum improved the children’s IQ, decreased behavior problems, and improved the home environment. The intervention was more effective with mothers with low educational attainment than those with high educational attainment, more effective for African American than White children, and effective for most at-risk children.
    Intervention programs have the most positive effects on children’s well-being when they (a) begin as early as possible, (b) provide services to parents as well as to the child, (c) have a low child-teacher ratio, (d) have high parental involvement, and (e) have frequent contacts. In one review of family intervention studies, intervention was more effective when there were eleven or more contacts between the intervener and the family; while eleven sessions is a somewhat arbitrary number, it does indicate that a certain duration of contact is necessary for intervention success.
The finding that children reared at home had low IQs at age 12 indicates
选项 A、parents fail to provide an adequate environment for their intelligence growth.
B、educational daycare centers are the best place for children to grow up in.
C、intellectual development and academic achievement of children are closely related.
D、the age of 12 is a critical point in time for intellectual development in children.
答案A
解析 细节题。文章第二段最后一句话指出，教育日托中心的护理对孩子的智力发展和学业成绩产生积极影响的时期明显是在孩子12岁时；第三段第一、二句话指出，一些家长在为婴儿的智力需求提供一个适当的环境时面临困难。这说明，在家抚养的孩子12岁时智商之所以低，是因为其父母没能力为其智力需求提供适当的环境。这与A项的意思相符。文中没有提到B、C；D与文章的意思不符。
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