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
33
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
Democracyisnotanewconception.TheancientAthenians【M1】______hadade
Cross-culturalLivingInadaptingtoanewculture,
Theclauseinthesentence"ItissaidthathehasgonetoShanghai"is______.A
A.共济失调步态 B.鸭子步态 C.跨阈步态 D.剪刀步态 E.扶膝步态
治疗疟疾首选的联合用药治疗方案是A.磷酸咯萘啶+伯氨喹啉 B.奎宁+伯氨喹啉
矿产勘探人员观察发现,不同颜色和形状的矿物结晶体虽然有格子不同的的名称和表象,但
(2015年真题)某儿童福利院接收了一些曾被拐卖的儿童,这些儿童健康状况差,经常
证券公司应当在营业场所妥善保存有关介绍业务的凭证、单据、账簿、报表、合同、数据信
甲、乙结婚多年,因甲沉迷于网络游戏,双方协议离婚,甲同意家庭的主要财产由乙取得。
下列材料中,属于土工复合材料的有()。A、土工布 B、塑料排水带 C、
最新回复
(
0
)