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
2023-09-12
84
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] 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://tihaiku.com/zcyy/3008542.html
相关试题推荐
Untilabout30yearsago,languageresearchersfocusedtheirstudiesoninfan
Untilabout30yearsago,languageresearchersfocusedtheirstudiesoninfan
Untilabout30yearsago,languageresearchersfocusedtheirstudiesoninfan
[originaltext]Inrecentyearsmanycountriesoftheworldhavebeenfacedw
Areorganicallygrownfoodsthebestfoodchoices?Theadvantagesclaimedfo
Areorganicallygrownfoodsthebestfoodchoices?Theadvantagesclaimedfo
Areorganicallygrownfoodsthebestfoodchoices?Theadvantagesclaimedfo
Areorganicallygrownfoodsthebestfoodchoices?Theadvantagesclaimedfo
IBMresearchersareattemptingtowarmuphuman-computerrelationships.For
IBMresearchersareattemptingtowarmuphuman-computerrelationships.For
随机试题
Somedaytherewillbearobotthattakesthedrudgery(苦工,单调沉闷的工作)outofh
Alanguageisasignalingsystemwhichoperateswithsymbolicvocalsounds,
Naturally,inagroupofanimalsasdiverseasthesnakes,andwithsomany
Therewasabigholeintheroadwhich___________(阻碍)thetraffic.heldup本题考查固定搭
水的体积随压力增加而增加的性质称为水的压缩性
衡量教师是否胜任本职工作的基本条件是()。A.教师的年龄 B.教师的体质
26岁初产妇,妊娠40周,规律宫缩8小时入院。查:髂棘闻径25cm,骶耻外径20
甲公司以挂牌方式取得一居住用地的使用权,出让年限比法定最高年限少18年,闲置1年
下列各项属于折扣定价的有()。 A.现金折扣 B.基点定价 C.
()是期货业的自律性组织,发挥政府与期货业之间的桥梁和纽带作用,为会员服务,维
最新回复
(
0
)