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
Recent research has claimed that an excess of positive ions in the air can have an ill effect on people’ s physical or psycholog
Recent research has claimed that an excess of positive ions in the air can have an ill effect on people’ s physical or psycholog
admin
2010-05-09
46
问题
Recent research has claimed that an excess of positive ions in the air can have an ill effect on people’ s physical or psychological health. What are positive ions? Well, the air is full of ions, electrically charged particles, and generally there is a rough balance between the positive and the negative charges (电荷). But sometimes this balance becomes disturbed and a larger proportion of positive ions are found. This happens naturally before thunderstorms, earthquakes or when winds such as the Mistral, Foehn, Hamsin or Sharav are blowing in certain countries. Or it can be caused by a build-up of static electricity indoors from carpets or clothing made of man-made fibres, or from TV sets, duplicators or computer display screens.
When a large number of positive ions are present in the air, many people experience unpleasant effects such as headaches, fatigue, irritability, and some particularly sensitive people suffer nausea or even mental disturbance. Animals are also found to be affected, particularly before earthquakes; snakes have been observed to come out of hibernation, rats to flee from their burrows, dog howl and cats jump about unaccountably. This has led the U.S. Geographical Survey to fund a network of volunteers to watch animals in an effort to foresee such disasters before they hit vulnerable areas, such as California.
Conversely, when large numbers of negative ions are present, people have a feeling of well-being. Natural conditions that produce these large amounts are near the sea, close to waterfalls or fountains, or in any place where water is sprayed, or forms a spray. This probably accounts for the beneficial effect of a holiday by the sea, or in the mountains with tumbling streams or waterfalls.
To increase the supply of negative ions indoors, some scientists recommend the use of ionisers: small portable machines which generate negative ions. They claim that ionisers not only clean and refresh the air, but also improve the health of people sensitive to excess positive ions. Of course, there are the detractors, other scientists, who dismiss such claims and are skeptical about negative/positive ion research. Therefore people can only make up their own minds by observing the effects on themselves, or on others, of a negative rich or poor environment. After all, it is debatable whether depending on seismic (地震的) readings to anticipate earthquakes is more effective than watching the cat.
A high negative ion count is likely to be found ______.
选项
A、near a pond with a water pump
B、close to a slowly flowing river
C、high on some barren mountains
D、near a fountain
答案
D
解析
推理题 见文章第三段最后两句话。文中说在有喷水或能形成水花的地方负离子多,故D项正确。
转载请注明原文地址:https://kaotiyun.com/show/wOOK777K
0
大学英语六级
相关试题推荐
eBayeBayisaglobalphenomenon—theworld’slargestgaragesale,onlineshoppingcenter,cardealerandauctionsitewith1
InMedievalEnglandthetallesthorseswereriddenbypeopleofthehighestrankwho,fromtheirlofty(36)______,lookeddowno
HowAmerica’sMostSuccessfulExecutivesAccomplishSoMuchinSoLittleTimeTheyheadthenation’sbiggest,fastest-growin
TheAmericaneducationsystemrequiresthatstudentscomplete12yearsofprimaryandsecondaryeducationpriortoattendinguni
TheAmericaneducationsystemrequiresthatstudentscomplete12yearsofprimaryandsecondaryeducationpriortoattendinguni
HaveyouheardofBali,aplacetothesouthofIndonesia?It’sasmallislandbutisbecomingmoreandmorefamousbyitsfasci
A、Theneedtoexercisethememory.B、Howthebraindiffersfromotherbodytissues.C、Theunconsciouslearningofaphysicalact
A、Listeningtodifferentstylesofconversations.B、Listeningtothecontentofdifferentconversations.C、Listeningtohowsale
A、4hours.B、6hours.C、12hours.D、18hours.BW:Whydowehavetofinishthisproposaltonight?It’salready6p.m.Can’twe
Thepurposeofthelargecompaniesinrecruitingoutsidersandputtingthemontheboardofdirectorsisto______.ProfessorJ
随机试题
下列成语,从庄子《秋水》一文中引申出来的有
虚劳患者,口干唇燥,不思饮食,大便燥结,甚则干呕,呃逆,面色潮红,舌红干少苔,脉细数。其证候是
企业用当年实现的利润弥补亏损时,应作的会计处理是()。
贾德根据“水下击靶”实验提出学习迁移理论的()
【材料一】一日,王教授应邀到甲机关举办一场关于职业道德与行为规范关系的专题讲座。会场里时常响起手机声,会议主持人不断地用手势提醒大家关闭手机,甚至打断王教授讲座,让大家保持会场秩序。次日王教授到乙机关举办同样的讲座,会场秩序井然,听讲座的每个人都自觉地
新民主主义文化,就是无产阶级领导的人民大众的反帝反封建的文化,即民族的科学的大众的文化。新民主主义文化是民族的,表明这种文化
求证:若向量a、b、c不共面,则向量a×b,b×c,c×a也不共面.
假设某计算机系统的内存大小为256KB,在某一时刻内存的使用情况表2-4(a)所示。此时,若进程顺序请求20KB,10KB和5KB的存储空间,系统采用(53)算法为进程依次分配后的内存情况表2-4(b)所示。
Inrecentyears,second-handtransactionhasbeenquitecommon.Inthemarket,youcanmeetmanysecond-handgoodssuchasbooks
A、ThenucleartransferB、TheprocesstakingDNAC、ThenormalreproductiveprocessD、ThecreationofcellsC克隆是个热门话题,有关克隆的文章无非谈论
最新回复
(
0
)