首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
When the heart breaks down, it beats irregularly or not at all. A bone can chip or snap. But when the complex network of neurons
When the heart breaks down, it beats irregularly or not at all. A bone can chip or snap. But when the complex network of neurons
admin
2013-07-30
89
问题
When the heart breaks down, it beats irregularly or not at all. A bone can chip or snap. But when the complex network of neurons in our brain fails to work, the result can be a near-endless variety and combinations of mental illnesses.
It is normal to sometimes be sad, happy, anxious, confused, forgetful or fearful, but when a person’s emotions, thoughts or behavior frequently trouble them, or disrupt their lives, they may be subject to mental illness. According to the World Health Organization(WHO), about 450 million people worldwide are affected by mental, neurological or behavioral problems at any time.
However, determining that someone has a mental illness, and which one, is one of the challenges psychiatrists face.
Historically, some symptoms of mental illness, such as eccentric behavior and hearing voices, have been taken as evidence of heavenly communication or demonic(恶魔的)possession.
More recently, brain scans have directly linked these conditions with changes in levels of neurotransmitters — chemicals that convey messages across neurons — or alterations in the number or structure of neurons in different brain areas. For instance, people suffering from depression often display lowered levels of the neurotransmitter serotonin(血清素).
In a few cases, the immediate cause of the malfunction has been identified. Alzheimer’s disease, a major source of dementia and memory loss in the elderly, is caused by the accumulation of protein plaques which choke neurons in the brain.
Some infectious diseases can also develop into a mental illness. Untreated HIV infection can cause dementia, as can the uncontrolled replication of the germ that causes syphilis(梅毒).
In many cases the precise cause is unclear and experts suspect that many different factors are involved. The chance that identical twins both develop schizophrenia(精神分裂症)is much higher than that for fraternal twins or siblings, proving the strong role of inherited genes. But scientists are accumulating a growing list of other risk factors that predispose people to this condition, including prenatal exposure to famine conditions, certain infections or exposure to lead. The season of their birth also seems important — birth in winter or early spring increases the risk, as does an older father and, controversially, child abuse.
Genes are also thought to influence many other mental health problems, including: anorexia, autism, Alzheimer’s disease and bipolar disorder.
Some researchers believe that smoking cigarettes and taking recreational drugs may elevate a user’s risk of mental illnesses.
According to the passage, Alzheimer’s disease is the main cause of the elderly people’s______.
选项
答案
dementia and memory loss
解析
空前的people’s表明,本空应填一名词(短语)。由题干中的Alzheimer’s disease将本题出处定位到第六段第二句。题干中的the main cause of对应该句的a major source of,the elderly people’s对应the elderly,故a major source of后的dementia and memory loss为本题答案。
转载请注明原文地址:https://kaotiyun.com/show/uG97777K
0
大学英语六级
相关试题推荐
A、Theyhavetofinishitquickly.B、Theyhavetousewhattheyhave.C、Theyhavetoworkhardanddotheirbest.D、Theymustred
YaoMing’spreseasonperformances,however,werequestionable,andleftmanywonderingwhyhewasthefirstoverallpick.Hesta
Ithasbeennecessarytoreferrepeatedlytotheeffectsofthetwoworldwarsinpromotingallkindsofinnovation.Itshouldb
MiltonFriedmanwaswrong.Inflationisalwaysandeverywhereasocialphenomenon,notamonetaryone.Atleast,thatishowRob
Marriedparentstendtobeof【C1】______thesameage.Husbandsareusuallyolderthantheirwives,butthisdifferenceinageha
TheGeneralElectricCompany,oftencriticizedforthecomplexityofitsstructureandtheresultingopacityofitsnumbers,sai
A、Hefeelsrushed.B、Hehatestopack.C、Hedoesn’tliketorestricthisdiet.D、He’sworriedabouthislecture.C根据第19题对选项的分析可知
Forestisacomplexecosysteminwhichtreesarethedominantlifeform.Treedominatedforestscanoccurwhereverthetemperatu
A、Satisfiedwiththeirvariety.B、Displeasedwiththeirquality.C、Pleasedwithmodernmass-productiontechniques.D、Dissatisfie
A、680yearsago.B、Hundredsofyearsago.C、Inthe19thcentury.D、ThedaywhenEnglandcolonized.C事实细节题。女士提到在八所常春藤学校中七所都成立于几百年
随机试题
临床上遇到急性喉阻塞时,行气管切开术的部位为
属于深反射检查的是
智齿(第三磨牙)冠周炎发病高峰年龄是
从事生产、销售假药及生产、销售劣药情节严重的企业或者其他单位,其直接负责的主管人员和其他直接责任人员几年内不得从事药品生产、经营活动()。
确定国家所有权客体必须坚持的基本原则是()。
公安机关执行逮捕的时候,必须出示逮捕证。逮捕后,应当立即将被逮捕人送看守所羁押。除无法通知的以外,应当在逮捕后()小时以内,通知被逮捕人的家属。
【斯大林格勒战役】(BattleofStalingrad)
OptimismamongtheUK’sbanksandbuildingsocietieshassoaredoverthepastthreemonthsasfirmsgrewprofitsandtookonmor
"Opinion"isawordthatisusedcarelesslytoday.Itisusedtorefertomattersoftaste,belief,andjudgment.Thiscasualus
A、Tenminuteslate.B、Tenminutesearly.C、Atteno’clock.D、Fiveminutesearly.B细节题。对话一开始,男孩便说Dr.Brown’sclassfinishedtenmi
最新回复
(
0
)