2016届高考英语冲刺综合训练解析6_高考复习指南

2016届高考英语冲刺综合训练解析6

　　4．Which of the following places has Helen not visited yet?

　　A．The North Pole.

　　B．The Sahara Desert.

　　C．The Gobi Desert.

　　D．Sichuan and Tibet.

　　5．Which is the best title for the text?

　　A．The Woman Who Loves Adventure

　　B．A Famous Woman

　　C．A Woman Mountain Climber

　　D．The Owner of Adventure Classroom

　　.任务型读写/任务型阅读

　　Attention deficit(不足)hyperactivity(活动过度)disorder is known by the letters A．D.H.D.Children 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，act and speak without thinking about the results of their behavior.These are among the signs named on the website 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 brainimaging 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 selfcontrol 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 completing an activity if they cannot expect some kind of reward in return. Researchers studied the pathways on which dopamine travels and A．D.H.D. Doctor Volkow says the researchers then compared the pathways to those of 44 adults without the disorder. “There is 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 are directly linked to the severity of the patient’s inattention，”she says.