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  3. Long time ago, everyone knew that regular bedtimes were important. "Dream on! " most modern parents might reply. But research by

Long time ago, everyone knew that regular bedtimes were important. "Dream on! " most modern parents might reply. But research by

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问题     Long time ago, everyone knew that regular bedtimes were important. "Dream on! " most modern parents might reply. But research by Yvonne Kelly of University College, London, shows that the【C1】______wisdom is right-half the time. Daughters, it seems, do【C2】______regular bedtimes. Sons do not.
    Dr Kelly knew of many studies that had looked at the connection between sleep habits and cognitive ability in adults and【C3】______. All showed that inconsistent sleeping【C4】______went hand in hand【C5】______poor academic performance. Surprisingly,【C6】______little such research had been done on children She【C7】______examined the bedtimes and cognitive abilities of 11,178 children born in Britain.
    She collected the bedtime information of the participants when they were nine months, three years, five years and seven years of age.【C8】______asking whether the children had【C9】______bedtimes on weekdays and if they always, usually, sometimes or never made them, she collected information about family【C10】______economic circumstances and other matters—including whether children were read to before they went to sleep and whether they had a television in their bedroom. The children【C11】______were also asked, at the ages of three, five and seven, to take standardized reading, mathematical and spatial-awareness tests, from which their IQs could be【C12】______.
    Dr Kelly’s report shows that by the time children had reached the age of seven, not having had a regular bedtime did seem to【C13】______their cognition, even when other relevant【C14】______such as bedtime reading, bedroom televisions and parents’ socioeconomic status were controlled for. But that was true【C15】______if they were female. On the IQ scale, girls who had had regular bedtimes【C16】______between eight and nine points more than those who did not.
    Boys were not completely unaffected. Irregular bedtimes left their IQs about six points below those of their【C17】______at the age of three. But the distinction【C18】______by the time they were seven.
    This difference between the sexes is【C19】______Dr Kelly did not expect it and has no explanation to offer for it. As scientists are accustomed to say, but this time with good reason, more research is【C20】______.
【C5】
选项 A、for
B、in
C、with
D、on
答案C
解析 从前文可得知研究的内容是睡眠习惯与认知能力的关系，因此空格处所填单词与gohand in hand搭配后应能表现出inconsistent sleeping schedules和poor academic performance的关系。go hand in hand with“与……密切相关”是固定搭配，故选C项。
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