首页
登录
职称英语
Recent research has claimed that an excess of positive ions in the air can h
Recent research has claimed that an excess of positive ions in the air can h
游客
2024-06-08
13
管理
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. [br] By observing the behavior of animals, scientists may be able to ______.
选项
A、prevent disasters
B、organize groups of people
C、predict earthquakes
D、control areas of California
答案
C
解析
细节题 见第二段最后一句话...to watch animals in an effort to foresee such disasters...
转载请注明原文地址:https://tihaiku.com/zcyy/3624807.html
相关试题推荐
[originaltext]Ateamofscientistsrecentlybeganaprojecttomeasurethe
[originaltext]Arecentfilm,TheGodsMustBeCrazy,describedthesocialc
[originaltext]Arecentfilm,TheGodsMustBeCrazy,describedthesocialc
"IamgeneralmanageroftherecentlyestablishedBritishdivisionofasmal
"IamgeneralmanageroftherecentlyestablishedBritishdivisionofasmal
"IamgeneralmanageroftherecentlyestablishedBritishdivisionofasmal
"IamgeneralmanageroftherecentlyestablishedBritishdivisionofasmal
Untilabout30yearsago,languageresearchersfocusedtheirstudiesoninfan
Untilabout30yearsago,languageresearchersfocusedtheirstudiesoninfan
Untilabout30yearsago,languageresearchersfocusedtheirstudiesoninfan
随机试题
Althoughfewwoulddenythatit’sbettertoberichthanpoor,forsomepeop
[originaltext]Millionsofwordshavebeenwrittenaboutyoungpeopleinthe
SpeakerA:IhavenoideawheretogointheSpringbreak.Gotanysuggestions?
Robotscouldfillthejobsof3.5millionpeopleinJapanby2025,athinkta
出版物进货的指导思想是:在恰当的时机,以优惠的价格,进到最优质、市场最需要的出版
A
财务报表分析法中的()是指对两个或几个有关的可比数据进行对比,揭示财务指标的差异
慢性脓胸病人术后局部垫一硬枕或沙袋压迫的目的是A.止血 B.减轻疼痛 C.控
《变电验收管理规定第26分册辅助设施验收细则》:改扩建工程采用的防误闭锁装置型式
下列关于厂房内中间仓库平面布置的做法中,错误的是()。A.某甲类中间仓库靠外墙
最新回复
(
0
)