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  3. In families with two working parents, fathers may have more impact on a child’s language development than mothers, a new study s

In families with two working parents, fathers may have more impact on a child’s language development than mothers, a new study s

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问题     In families with two working parents, fathers may have more impact on a child’s language development than mothers, a new study suggests.
    Researchers【B1】______92 families from 11 child care centers before their children were a year old, interviewing each to establish income, level of education and child care arrangements overall, it was a group of well-educated middle-class families, with married parents both living in the home.
    When the children were 2, researchers videotaped them at home in free-play sessions with both parents, 【B2】______all of their speech. The study will appear in the November issue of the Journal of Applied Developmental Psychology.
    The scientists measured the【B3】______number of utterances(话语)of the parents, the number of different words they used, the complexity of their sentences and other【B4】______of their speech. On average, fathers spoke less than mothers did, but they did not differ in the length of utterances or proportion of questions asked.
    Finally, the researchers【B5】______the children’ s speech at age 3, using a standardized language test. The only predictors of high scores on the test were the mother’ s level of education, the【B6】______of child care and the number of different words the father used.
    The researchers are【B7】______the father’s speech, and not the mother’s, had an effect.
    "It s well【B8】______that the mother’s language does have an impact, " said Nadya Pancsofar, the lead author of the study. It could be that the high-functioning mothers in the study had【B9】______had a strong influence on their children’s speech development, Ms. Pancsofar said, "or it may be that mothers are【B10】______in a way we didn’ t measure in the study. "
A. already
B. analyzed
C. aspects
D. contributing
E. established
F. quality
G. quoted
H. recording
I. recruited
J. total
K. unconscious
L. unsure
【B10】
选项
答案D
解析 分析句子结构，这里缺少形容词或动词的现在分词。结合上下文，最后一段讨论母亲的影响力，结合文章，contributing(贡献)最符合。其他动词词义用在此处均不符合题意。
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