第Ⅱ卷 (非选择题共35分)第四部分写作 (共两节，满分35分)第一节任务型阅读(共10小题；每小题1分，满分10分)认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入一个

第Ⅱ卷 (非选择题共35分)
第四部分写作 (共两节，满分35分)
第一节任务型阅读(共10小题；每小题1分，满分10分)
认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。
注意：每个空格只填1个单词。请将答案写在答题卡相应题号的横线上。
Attention deficit (不足) hyperactivity (活动过度) disorder is known by the letters A. D. H. D. with A. D. H. D. might have trouble paying attention. They might not seem to listen and might forget things. They might not be able to stay seated or play quietly. They might talk too much and act and speak without thinking about the results of their behavior. These are among the signs named on the web site of America's Centers for Disease Control and Prevention.
Doctors usually identify the disorder in children. But experts say the behaviors often last into adulthood. Researchers have been looking for the cause or causes of attention deficit hyperactivity disorder. Now, a brain-imaging study offers more evidence that could lead to new ways to treat it. Researchers say they observed shortages in the brain's reward system in patients with A. D. H. D. The study found that levels of some proteins were lower than normal. Nora Volkow, director of the National Institute on Drug Abuse, says the lack of attention and self-control that mark A. D. H. D. could be caused by problem in the flow of dopamine (多巴胺) . She says people might have difficulty pleting an activity if they cannot expect some kind of reward in return. Researchers studied the pathways on which dopamine travels in 53 adults with A. D. H. D. Doctor Volkow says the researchers then pared the pathways to those of 44 adults without the disorder. There was a lower concentration of dopamine markers in the brain of individuals with A. D. H. D., specifically in the areas of the brain that are involved with reward and motivation. And the dopamine levels were directly linked to the severity, of the patient's inattention she says.
The study used brain images taken at Brookhaven National Laboratory in New York State. Gene -Jack Wing is chairman of the Brookhaven medical department. He says the finding might also help explain why people with A. D. H. D. are mere likely to abuse drugs or overeat. He says they might be attempting to increase their dopamine levels to make up for the deficits in their reward system.
Title
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