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.
【C17】

选项 A、meanwhile
B、therefore
C、however
D、moreover

答案C

解析 上一句提到大都分婴儿会学会让自己冷静下来然后入睡,而这句提到有行为障碍的婴儿却学不会自我控制,前后有意思上的转折。故选C项however“然而”。
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