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

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

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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【62】children with hyperactivity and extremely distracted and impulsive. These frequent name changes show how【63】researchers are about the causes of the problem and the diagnostic (诊断的)【64】for the disorders.
    In the past several years, the people who study attention deficit hyperactivity disorder (ADHD) have【65】to clarify the disorder’s causes and【66】, and have reasons to believe that it may be【67】. 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【68】in the brain’s circuitry and self-control. The loss of self-control【69】other important brain functions compulsory for【70】attention. ADHD【71】two sets of symptoms: inattention and a【72】of hyperactive and impulsive behaviors. Most children are more active and【73】than adults are. Children are more inconsistent,【74】by brief actions. The younger the child, the【75】aware they are. This behavior is a【76】of a problem when it is displayed more in them than in their【77】. Boys are at least three times more【78】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【79】occur between the ages of 3 and 5.【80】, some children don’t start to develop the disorder until late childhood or early adolescence. Researchers are unable to find the reasons for this【81】.  
选项 A、initiated
B、commenced
C、originated
D、embarked
答案B
解析 语义衔接题。前文中提到，研究者对于儿童的这些病症还不是很清楚。本句说在过去的几年里，ADHD研究者们应该是开始弄清楚了，故答案为B commenced“开始，着手”，后接动名词或不定式。
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