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(冲动的). These frequent name changes show how【C2】______researchers, are about the causes【C3】______the problem and the diagnostic criteria for the disorders. In the past several years, the people who【C4】______attention deficit hyperactivity disorder(ADHD)have【C5】______to clarify the disorder’s causes and【C6】______, and have reasons to believe that it may be genetic. Today’s view【C7】______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【C8】______in the brain’s circuitry and self-control. The loss of self-control【C9】______other important brain functions mandatory for maintaining【C10】______. ADHD involves two sets of symptoms: inattention and a【C11】______of hyperactive and impulsive behaviors. Most children are more active and distractive than adults are. Children are more inconsistent, affected by brief actions. The younger the child, the less【C12】______they are. This behavior is a【C13】______of a problem when it is displayed more in them than in their【C14】______. Boys are at least three times more【C15】______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【C16】______disorders in the nervous system. These behaviors generally【C17】______between the ages of 3 and 5.【C18】______, some children don’t start to develop the disorder until【C19】______childhood or early adolescence. Researchers are unable to find the reasons for this【C20】______.
【C9】
选项 A、dictates
B、fulfils
C、performs
D、weakens
答案D
解析 动词辨义题。这句的意思是“自控能力的缺乏减弱了其他重要的大脑功能”。用排除法选出D) weakens“削弱，使变弱”符合句意。dictates“命令，指示”；fulfils“履行，实现”；performs“做，执行”。
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大学英语四级

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