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
2025-04-14
23
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 charged. But sometimes this balance becomes disturbed and a larger proportion of positive ions are found. This happens naturally before thunderstorm, earthquakes when winds such as the Mistral, 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 fibers, 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 affected, particularly before earthquakes, snakes have been observed to come out of hibernation, rats to flee from their burrows, dogs 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, then 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 readings to anticipate earthquakes is more effective than watching the cat. [br] What kind of machine can generate negative ions indoors?
选项
A、Ionisers.
B、Air-conditioners.
C、Exhaust-fans
D、Vacuum pumps.
答案
A
解析
本题为细节题。根据原文最后一段“To increase the supply of negative ions indoors,some scientists recommend the use of ionisers.”可知,ioniser可以制造室内负离子,因此,A选项为正确选项。
转载请注明原文地址:https://tihaiku.com/zcyy/4037453.html
相关试题推荐
Inrecentyears,therehasbeenasteadyassaultonsaltfromthedoctors:s
Manhaslongwishedtopredictearthquakes.Recentfindingsindicatethatr
Manhaslongwishedtopredictearthquakes.Recentfindingsindicatethatr
Whatdoconsumersreallywant?That’saquestionmarketresearcherswouldlo
Whatdoconsumersreallywant?That’saquestionmarketresearcherswouldlo
Whatdoconsumersreallywant?That’saquestionmarketresearcherswouldlo
Whatdoconsumersreallywant?That’saquestionmarketresearcherswouldlo
Whenconcernedparentsprotesttheexcessivesexorviolenceontelevision,
(复旦大学2011年试题)Aconsiderableamountofmedicalresearchisaimedatidentify
(复旦大学2011年试题)Aconsiderableamountofmedicalresearchisaimedatidentify
随机试题
[originaltext]TheUSStateDepartmentsaysSecretaryofStateCondoleezzaRic
TheholidayshoppingseasongotofftoaflyingstartovertheThanksgiving(
[originaltext]Today,ChineseAmericansmakeuplessthan1%oftheU.S.pop
监理员在巡视中发现,由分包单位施工的路面工程存在质量缺陷,即签发《监理通知单》要
给定关系R(A,B,F,G)和关系S(A,C,D,E,H),对其进行自然连接运算
血浆中含量最多的甲状腺激素是A.游离T B.结合型T C.游离T D.结合
前磨牙支托长约为基牙面近远中径的多少()A.1/5 B.2/3
关于胎心率早期减速的描述,正确的是A.是脐带受压的表现 B.下降幅度<60次/
属于《消防法》规定的禁止性行为包括()。A、违反消防安全规定进入生产、储存易
患者女,32岁。会阴侧切产下一名女婴,对于李女士侧切伤口红肿,护士遵医嘱给予红外
最新回复
(
0
)