首页
登录
职称英语
Recent research had claimed that an excess of positive ions in the air could
Recent research had claimed that an excess of positive ions in the air could
游客
2024-02-19
31
管理
问题
Recent research had claimed that an excess of positive ions in the air could 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. If the 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 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 found to be affected, particularly before earth- quakes; 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 US 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 that 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 in 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] According to the passage, static electricity can be caused by _______.
选项
A、using home-made electrical goods
B、wearing clothes made of natural materials
C、walking on artificial floor coverings
D、sorting food in a refrigerator
答案
C
解析
推理判断题。根据第一段最后一句话,这种static electricity(静电)可能来源于地毯,人造纤维衣物,电视,复印机和电脑显示器。据此可以推断接触上述物品可以产生静电,因此选C。
转载请注明原文地址:https://tihaiku.com/zcyy/3463759.html
相关试题推荐
[originaltext]ArecentsurveyreleasedbytheModernLanguageAssociationo
[originaltext]AmotherinTamilNadu,India,recentlyhadaquestionforou
[originaltext]W:Whathaveyoubeenuptorecently?M:Burningthemidnightoil
Manypeopleviewretirementasatimetostopworking.Butnewresearchshow
Manypeopleviewretirementasatimetostopworking.Butnewresearchshow
ApaperpublishedbytworesearchersattheUniversityofLondonclaimstop
ApaperpublishedbytworesearchersattheUniversityofLondonclaimstop
ApaperpublishedbytworesearchersattheUniversityofLondonclaimstop
Onlyinrecentyears______(人们才开始认识到保护野生动物的重要性).havepeoplebeguntorealizethe
Heclaimedthatitwasherrudenessthat______himtostrikeher.A、proposedB、pro
随机试题
BusinessasUsualVocabularyandExpressionsTuvalupiqueevacuati
用拆字先生的办法,望文生义,家最初显然和猪圈有关,而家的发展,当然是让它越来越不像猪圈。不过,我并不喜欢那些一尘不染的家庭。清洁过了头,家反而不像家。家
Whatisthepurposeoftheparty?To______toMr.Smith.[br][originaltext]
[originaltext]TherearethreegroupsofEnglishlearners:beginners,interm
方程xdy/dx=yln(y/x)的通解为( )。A.ln(y/x)=Cx-1
关于滤线栅的使用,下列描述正确的是A.聚焦栅不能反置 B.X线中心无需对准滤线
财务公司风险管控体系是指在完善集团风险管理和内部控制体系的基础上,将财务公司纳入
免疫球蛋白独特型抗原是()。A.异种抗原 B.同种异型抗原 C.异嗜性抗原
某中学地理研究性学习小组,在校园内用立杆测影法测算当地正午太阳高度(如下图所示)
患者女,23岁。上前牙2年前不慎折断,未及时处理。现上唇肿胀,检查发现牙冠冠折3
最新回复
(
0
)