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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 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】________.
【C15】
选项 A、even
B、as
C、only
D、else
答案C
解析 文章第一段已经讲到有规律的就寝时间只对女孩有影响，only if意为“只有”，和第一段呼应，符合语义逻辑，故选C项。A项even if“即使”，表示假设，但此句表示条件。B项习as if“好像”，代入后语义不通顺。D项else if没有此短语。  
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