英语六级暑期听力练习26
英语六级听力部分算是同学们考试时的难点吧。听力这部分不能急于求成，需要时间来练习。对于这部分同学们平时在积累词汇的基础上多加练习就可以，听的多了就能掌握技巧，距离12月份的四六级考试还有一段时间，同学每天练习一点听力，考试时听力就能取得高分了。听力音频点击下载
听力材料：
Clinical depression is a serious medical condition.The word "clinical" is added to separate people whoare depressed from those who simply feel sadbecause of life events. People with clinical depression can feel very sad, hopeless, andunimportant. Often they are unable to live in a normal way. Some people who suffer fromdepression kill themselves.
Clinical depression can be a difficult disease for medical professionals to diagnose, or identify.And it is difficult to treat -- what may work for one patient suffering from depression may notwork for another.
Some experts estimate that medicine used to treat depression is effective in treating 80 to 90percent of patients. But other studies suggest medication is not much better at reducing levelsof clinical depression than a placebo. A placebo is an inactive substance given to patientswho do not know it is not medicine.
Helen Mayberg is a researcher at Emory University in Atlanta, Georgia. She says the firsttreatment for depression often fails.
depression
"The problem is that whatever you get, the published numbers, even in randomized studies, isgetting people well -- the remission rate is about 40 percent, which means, for most people,the first thing you are given is not likely to work."
That means doctors must try different methods of treatments until they find one that iseffective.
But technology may change that. Ms. Mayberg leads a team of researchers at Emory University.They used brain imaging technology called P.E.T., or positron emission tomography to studytreatment effects. The study involved 63 depressed patients.
P.E.T. uses a radioactive sugar molecule that follows brain activity. This sugar molecule "lightsup" areas of the brain that become affected by stimuli. Two kinds of stimuli were used in thestudy -- medication or talk therapy.
The researchers found that one area of the brain -- called the anterior insula -- seemed topredict which treatment would work.
Patients with a slow-working anterior insula did best with cognitive talk therapy. Patients witha very busy anterior insula reacted well to medication -- a drug called Lexapro.
Ms. Mayberg says the anterior insula is part of a system in the brain that watches over the innerstate of the body. The anterior insula is activated during times of extreme pain or suffering.
Ms. Mayberg says the insula may be a biological marker for depression. She says her team'sfindings could help doctors treat psychiatric disorders in the same way they treat other medicalconditions.
"...where we do tests of various sorts to make management decisions all the time. Whereas inbreast cancer, we do tumor markers in order to determine both that a treatment is likely tohelp you but also determine without a marker that certain treatments are not for you."
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