题目内容：

完形填空

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。

In families with two working parents, fathers may have more impact ______ a child’s language development than mothers, a new study. ______ Researchers______ 92 families from 11 child care centers before their children were a year old, interviewing each to establish income, ______ of education and child care arrangements. ______ , it was a group of well-educated middle-class families, ______  married parents both living in the home.

When the children were 2, researchers videotaped them at home in free-play sessions with both parents, recording all of their ______. The study will appear in the November ______ of The Journal of Applied Developmental Psychology.

The scientists ______ the total number of utterances of the parents, the number of different words they used, the ______ of their sentences and other aspects of their speech. ______ average, fathers spoke less than mothers did, but they did not ______in the length of utterances or proportion(比例)of questions asked.

Finally, the researchers ______  the children’s speech at age 3, using a standardized language test. The only predictors of high ______ on the test were the mother’s level of education, the  ______ of child care and the number of different words the father used.

The researchers are ______  why the father’s speech, and not the mother’s, had an effect. “It’s well   ______ that the mother’s language does have an impact,” said Nadya Pancsofar, the lead author of the study. “It ______  be that the high-functioning mothers in the study had already had a strong influence   ______   their children’s speech development, or it may be that mothers are  ______ in a way we didn’t measure in the study.”

1.A. inB. atC. onD. with

2.A. reportsB. informsC. assumesD. suggests

3.A. appointedB. recruitedC. enrolledD. admitted

4.A. levelB. standardC. yearsD. degree

5.A. MoreoverB. OverallC. In allD. Luckily

6.A. andB. orC. withD. without

7.A. speechB. actionC. expressionD. response

8.A. publicationB. versionC. editionD. issue

9.A. recordedB. measuredC. includedD. estimated

10.A. simplicityB. complexityC. easinessD. difficulty

11.A. OnB. InC. ForD. At

12.A. changeB. speakC. differD. specialize

13.A. videotapedB. predictedC. comparedD. analyzed

14.A. valuesB. scoresC. standardsD. qualities

15.A. effectB. intensityC. qualityD. strength

16.A. awareB. unawareC. sureD. unsure

17.A. understoodB. Constituted     C. established  D. informed

18.A. shouldB. couldC. had toD. used to

19.A. withB. inC. atD. on

20.A. contributingB. cultivatingC. instructingD. enlightening