首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Recent research had claimed that an excess of positive ions(离子)in the air can have an ill-effect on people’s physical or psychol
Recent research had claimed that an excess of positive ions(离子)in the air can have an ill-effect on people’s physical or psychol
admin
2014-03-25
54
问题
Recent research had claimed that an excess of positive ions(离子)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. But sometimes this balance becomes disturbed and a larger proportion of positive ions are found. This happens naturally before thunderstorms, earthquakes or when winds 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(恶心)or even mental disturbance. Animals are also found to be affected, particularly before earthquakes; snakes have been observed to come out of hibernation(冬眠), 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 all 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 ionizers; small portable machines which generate negative ions. They claim that ionizers 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.
What effect does excessive positive ions have on some people?
选项
A、They think they are mad.
B、They feel very tired.
C、They become violently sick.
D、They are too tired to do anything.
答案
B
解析
题干中的excessive对应的是第二段首句中的a large num—ber of“过多的,大量的”,而B中的very tired与此句中的fatigue“疲劳”相对应,所以应选B。
转载请注明原文地址:https://kaotiyun.com/show/r7xd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlagmakesbusinesstravelerslessproductiveandmorepr
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlagmakesbusinesstravelerslessproductiveandmorepr
Amultinationalcorporationisacorporateenterprise,whichthoughheadquarteredinonecountry,conductsitsoperationsthroug
A80-yearoldmanfromCincinnatiinAmericaismakinglegalhistorybysuingdoctorswhosavedhiswife.EdwardWinterhaswitn
A80-yearoldmanfromCincinnatiinAmericaismakinglegalhistorybysuingdoctorswhosavedhiswife.EdwardWinterhaswitn
Directions:Youareallowedthirtyminutestowriteacompositiononthetopic:Tuitionsystem.Youshouldbaseyourcomposition
Thisisahistoricoccasion.AndIamparticularlypleasedtoseeChairmanDengXiaopingisabletobepresent. 【61】TheJ
Helandedinthiscountrywhenhewas4yearsoldwithoutawordofEnglish,andtherehehasrecentlygraduatedwithhonorsf
Helandedinthiscountrywhenhewas4yearsoldwithoutawordofEnglish,andtherehehasrecentlygraduatedwithhonorsf
随机试题
Asanymiddle-classparentknows,unpaidworkexperiencecangiveyoungstersavaluableintroductiontoasecurejob.Thegovern
肺结核中后果严重,对社会危害最大的类型是()
A.激素B.泻药C.食醋D.氢氧化锌凝胶E.氢氧化钠食管误吞或吞服强酸可服用中和剂是
理气剂不适用于
任何单位不得将产生严重污染的生产设备转移给其他单位使用。()
( )是金融工具在必要时迅速转变为现金而不致遭受损失的能力。
我国中小学开设的语文、数学、外语等课程属于()
“秋毫无犯”“人为刀俎,我为鱼肉”“项庄舞剑,意在沛公”等成语都出自《史记.项羽本纪》中关于鸿门宴一事的记载。()
设X是离散型随机变量,其分布函数为又设Y是连续型随机变量,其概率密度为记a=P{X一1},则概率P{y≥a)=________.
Accordingtothetheoryof"thought"devisedbyJ.B.Watson,thinkingis______.Whyarepatientswithspeechdisordersableto
最新回复
(
0
)