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
43
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.
People should be able to come to a decision about ions in the air if they______.
选项
A、note their own reactions
B、move to a healthier area
C、observe domestic animals
D、watch how wealthy people behave
答案
A
解析
come to a decision是make up their own minds的同义转述,故可定位在倒数第二段倒数第一句话,意思和A“注意他们的反应”正符合。
转载请注明原文地址:https://jikaoti.com/ti/cFasFFFM
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
Whenweuseawordinspeechandwriting,itsmostobviouspurposeistopointtosomethingorrelationorproperty.Thisisth
A80-yearoldmanfromCincinnatiinAmericaismakinglegalhistorybysuingdoctorswhosavedhiswife.EdwardWinterhaswitn
A80-yearoldmanfromCincinnatiinAmericaismakinglegalhistorybysuingdoctorswhosavedhiswife.EdwardWinterhaswitn
A80-yearoldmanfromCincinnatiinAmericaismakinglegalhistorybysuingdoctorswhosavedhiswife.EdwardWinterhaswitn
Accordingtothetalkitisacommonsensethat______.
Theriseofmultinationalcorporations,globalmarketing,newcommunicationstechnologies,andshrinkingculturaldifferencesha
Recentlyhousingisrecognizedasa"sociallydeterminantvariable".InFrance,housingisthemainitemofexpenditureint
Recentlyhousingisrecognizedasa"sociallydeterminantvariable".InFrance,housingisthemainitemofexpenditureint
Recentlyhousingisrecognizedasa"sociallydeterminantvariable".InFrance,housingisthemainitemofexpenditureint
Helandedinthiscountrywhenhewas4yearsoldwithoutawordofEnglish,andtherehehasrecentlygraduatedwithhonorsf
随机试题
根据使用场所的潮湿、化学腐蚀、温度等环境因素及额定电压要求,选择适宜的电线电缆,其中固定敷设的供电线路宜选用()线缆。
男性,46岁。有乏力、腰背痛2年,常有便秘,既往高血压病史5年。查体:腹部稍膨隆,四肢近端较细,胸椎x线提示有骨质疏松,B超显示左侧肾上腺可见一直径约3.5cm肿物,临床拟诊为“皮质醇增多症”。患者确诊为“肾上腺腺瘤”,对该患者的治疗原则,正确的是
下列何药含有利血平这一成分
维持血液不逸出于脉外是气的何种作用的体现
在环境影响评价中,通常把建设项目对环境的影响分成()。
“经营单位”栏:()。“随附单据”栏:()。
在零售商业物业的经营理论中,最大程度地实现“聚集效益”的方法是()
工作性质,一般通过职业活动的对象、从业方式等的不同予以体现。()
《3~6岁儿童学习发展与指南》指出,“幼儿的发展是一个持续、渐进的过程,同时也表现出一定的()特征”。
______theRadioCommunicationsDirectory,thereare16,376licensedradiostationscurrentlybroadcasting.
最新回复
(
0
)