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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 c

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

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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 enough 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.
【C19】
选项 A、blood
B、organ
C、cell
D、gene
答案D
解析 本句说的是科学家最近识别出一种与多巴胺功能(dopamine function)有关的什么。根据上文的genetically(遗传上)，可知科学家发现的东西与遗传有关。与遗传有关的东西是基因，故选D项gene“基因”。A项blood“血液”，B项organ“器官”，C项cell“细胞”，这三项都不能用a version of (一个版本)来修饰。
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