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  3. Crying and waking up in the middle of night are routine during any newborn’s first few months. But if those crying episodes cont

Crying and waking up in the middle of night are routine during any newborn’s first few months. But if those crying episodes cont

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问题     Crying and waking up in the middle of night are routine during any newborn’s first few months. But if those crying episodes continue on a regular【C1】______past the first year, then they may signal possible behavioral problems【C2】______.
    That’s what researchers in Europe found when they【C3】______nearly two dozen studies on something developmental experts call regulatory problems—which include trouble sleeping, continuous crying and difficulty feeding. The researchers【C4】______in the journal Archives of Disease in Childhood that infants who consistently cry and wake up at night past their third month are nearly twice as likely to【C5】______problems such as attention deficit hyperactivity disorder (ADHD), depression, anxiety, aggressive behavior or【C6】______disorders by the time they begin school. The most【C7】______behavioral difficulties these children had involved【C8】______of self-control, and an inability to calm themselves down or act【C9】______in different social situations.
    How exactly are【C10】______crying jags and picky eating during infancy【C11】______later behavioral problems? Dieter Wolke, one of the study co-authors and a professor of developmental psychology at University of Warwick in England, says the data don’t support any【C12】______link, but there are several possibilities. One, the crying and waking up at night are simply the first signs of behavioral problems that the babies can not【C13】______themselves very well. Every baby wakes up several times a night and may start crying, but most will eventually learn to calm themselves down and【C14】______back to sleep. They learn that enough is e-nough and inevitably【C15】______that Mom and Dad won’t come running every time they cry. If babies are already【C16】______to contracting a behavioral disorder, 【C17】______, they may not be able to learn such self-control, and their crying episodes may continue well past their first year.
    【C18】______, says Wolke, some infants may be genetically susceptible to problems regulating their behavior; specifically, scientists have recently identified a version of a【C19】______concerning dopamine function, which governs mood and emotions as well as motor function, that may make some infants more【C20】______to behavioral problems.
【C20】
选项 A、attentive
B、careless
C、vulnerable
D、fragile
答案C
解析 本段第一个分句“有些婴儿由于遗传因素，在规范自己的行为方面更容易产生问题”，本空格所在分句应该是具体说明受到多巴胺影响的婴儿更容易出现行为问题，和句首呼应。故选C项vulnerable“易受损害的”。
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