2. 外语
  3. Children have been said to have brain-injured child syndrome, hyperactive(极度活跃的)child syndrome and attention-deficit disorder(AD

Children have been said to have brain-injured child syndrome, hyperactive(极度活跃的)child syndrome and attention-deficit disorder(AD

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问题     Children have been said to have brain-injured child syndrome, hyperactive(极度活跃的)child syndrome and attention-deficit disorder(ADD). As early as the 1940’s, psychiatrists have【C1】______children with hyperactivity and extremely distracted and impulsive. These frequent name changes show how【C2】______researchers are about the causes of the problem and the diagnostic(诊断的) 【C3】______for the disorders.
    In the past several years, the people who study attention deficit hyperactivity disorder(ADHD)have【C4】______to clarify the disorder’s causes and【C5】______. and have reasons to believe that it may be【C6】______. Today’s view on this disorder is very different from the beliefs of just a few years ago.
    Researchers are finding that ADHD is not a disorder of just attention, but is from a developmental【C7】______in the brain’s circuitry and self-control. The loss of self-control【C8】______other important brain functions compulsory for【C9】______attention. ADHD【C10】______two sets of symptoms: inattention and a【C11】______of hyperactive and impulsive behaviors. Most children are more active and【C12】______than adults are. Children are more inconsistent, 【C13】______by brief actions. The younger the child, the【C14】______aware they are. This behavior is a【C15】______of a problem when it is displayed more in them than in their【C16】______. Boys are at least three times more【C17】______than girls to have ADHD. Studies have found that ADHD in boys outnumbers girls 9 to 1; this is because boys are genetically likely to develop disorders in the nervous system. These behaviors【C18】______occur between the ages of 3 and 5.【C19】______. some children don’t start to develop the disorder until late childhood or early adolescence. Researchers are unable to find the reasons for this【C20】______.
【C15】
选项 A、sign
B、signal
C、mark
D、symbol
答案A
解析 语义衔接题。一种行为应该是一种问题的“征兆”，故答案为[A]sign，指某种情况的征兆。[B]signal指为某一目的而有意发出的信号；[C]mark指便于辨认而有意做的标记，又可指自然形成的标记或有别于其他事物的特征；[D]symbol指作象征或表达某种深邃意蕴的特殊事物。
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大学英语六级

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