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 psych
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 psych
admin
2015-08-09
29
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.
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、copying TV programs on a computer.
答案
C
解析
由题干static electricity定位在首段末句,用人造纤维做成的地毯或衣物可能产生静电。man—made“人造的”相当于artificial。故C为答案。文中仅提到电视机、复印机和电脑显示屏会产生静电,而A说法太笼统了,所以不选。
转载请注明原文地址:https://kaotiyun.com/show/nQRd777K
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
TheInternetraisesmajorissuesandchallengesforeducation,notjustinChinabutallovertheworld.Yetitsimplycannot
Decision-makingisacomplexbusinesssubjectwhichcombinesthemostcomplicatedelementsoftheoperationalandtheoreticala
Sincethedawnofhumaningenuity,peoplehavedevisedevermorecunningtoolstocopewithworkthatisdangerous,boring,burd
Atleast,howmanyyearswillPeoplewhoareoverweightat40lose?
Accordingtothepassage,whattypeoffood/drinkismostlikelytocausedentaldecay?
Howlongisitsincethefirstnewspaperwasprinted?
WhydosomanyAmericansdistrustwhattheyreadintheirnewspapers?TheAmericanSocietyofNewspaperEditorsistryingtoan
Whatkindoffoodismostlikelytocausedentaldecay?
随机试题
联系实际谈谈如何应付挫折。
如果左室壁局部梗死灶存在存活心肌,应用小剂量多巴酚丁胺介入,会出现下列哪种表现
上唇的解剖形态是
男,28岁。被沸水烫伤,右手掌焦痂呈皮革样,不痛,面部红斑,表面干燥,左上肢、颈部、胸腹部、双足和双小腿均为水疱,有剧痛,并发生低血容量性休克。估计该病人Ⅱ度烧伤面积为
安全阀是所有蓄力器都应有的安全装置,下列关于安全阀的说法中,正确的是()。
在统一币种方面,不同币种的价格之间的换算,应采用()的汇率。
以下()为散客旅游提供了便利的技术条件。
循序渐进原则是教学原则的一种,以下说法体现该原则的有()
艺术
设x是小于10的非负数。对此陈述,以下正确的VB表达式是
最新回复
(
0
)