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
42
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.
A high negative ion count is likely to be found
选项
A、near a pond with a water pump
B、close to a slow-flowing river
C、high in some barren mountains
D、by a rotating water sprinkler
答案
D
解析
第三段第二句话指出,产生大量负离子的自然条件是靠近大海、瀑布或喷泉的地方,或任何有喷水或形成水花的地方。因此答案为D“在旋转的喷雾器旁”。
转载请注明原文地址:https://jikaoti.com/ti/PFasFFFM
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
Willpeopleevertamethedestructive,oftendeadlyhurricane?Eitherscientistsormeteorologistsdonotyetunderstandthefor
Asmartmanoncesaidthattheonlythingnecessaryforthetriumphofevilisforgoodmentodonothing.So,asapoliceman,I
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlagmakesbusinesstravelerslessproductiveandmorepr
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlagmakesbusinesstravelerslessproductiveandmorepr
Amultinationalcorporationisacorporateenterprise,whichthoughheadquarteredinonecountry,conductsitsoperationsthroug
Amultinationalcorporationisacorporateenterprise,whichthoughheadquarteredinonecountry,conductsitsoperationsthroug
Besidesreporters,whoelsewerecampedoutfordaysoutsidethespeaker’shome?
Besidesreporters,whoelsewerecampedoutfordaysoutsidethespeaker’shome?
Whatiscommontragedyeverywhereaccordingtothepassage?
Thisisahistoricoccasion.AndIamparticularlypleasedtoseeChairmanDengXiaopingisabletobepresent. 【61】TheJ
随机试题
行政机关可以自行处理罚没财物。
【B1】【B3】
男性,21岁,因饱餐后活动,突感中腹部剧烈疼痛,阵发加重,伴呕吐,未排气、排便。查体:腹部隆起,压痛明显,肠鸣音亢进。最可能的诊断是
机体的阴液或阳气突然大量亡失,导致生命垂危的病理状态,为由于阴或阳的--方偏盛至极,因而壅遏于内,将另一方排斥于外,迫使阴阳之间不相维系,从而出现真寒假热或真热假寒等复杂的病理现象,为
某工程双代号网络计划如下图所示,图中已标出每项工作的最早开始时间和最迟吁始时间,该计划表明()。
消防应急照明和疏散指示系统供配电检查中,应急照明回路沿电缆管井垂直敷设时,公共建筑应急照明配电箱供电范围不宜超过8层,住宅建筑不宜超过()层。
无论是经营杠杆系数变大,还是财务杠杆系数变大,都可能导致企业的总杠杆系数变大。()
()是符号互动论现代的重要代表人物。
智慧城市通过物联网基础设施、云计算基础设施、地理空间基础设施等新一代信息技术以及维基、社交网络、FabLab、LivingLab、综合集成法,网动全媒体融合通信终端等工具和方法的应用。实现全面透彻的感知、宽带泛在的互联、智能融合的应用。由此可见,智慧城市建
根据《国家赔偿法》的规定,下列哪些情形,国家承担赔偿责任?()
最新回复
(
0
)