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
There is no question that the old style of air pollution could kill people. In one week following the infamous "peasouper" fog i
There is no question that the old style of air pollution could kill people. In one week following the infamous "peasouper" fog i
admin
2013-01-25
84
问题
There is no question that the old style of air pollution could kill people. In one week following the infamous "peasouper" fog in December 1952, 4, 700 people died in London. Most of these people were elderly and already had heart or lung diseases. A series of these killer fogs eventually led to the British Parliament passing the Clean Air Act which restricted the burning of coal.
Fortunately the effect of smog on the lungs is not so dramatic. Scientists have now conducted a number of laboratory experiments in which volunteers are exposed to ozone inside a steel chamber for a few hours. Even at quite low concentrations there is a reversible fall in lung function, an increase in the irritability of the lungs and evidence of airway inflammation (发炎). Although irritable and inflamed lungs are particularly seen in people with asthma (哮喘) and other lung diseases, these effects of ozone also occur in healthy subjects. Similar changes are also seen after exposure to nitrogen dioxide, although there is some disagreement about the concentration at which they occur.
Other studies have found that people living in areas with high levels of pollution have more symptoms and worse lung function than those living in areas with clean air. Groups of children attending school camps show falls in lung function even at quite low concentrations of ozone. There is also a relationship between ozone levels and hospital admissions for asthma, both in North America and Australia. It is suspected that long-term exposure to smog may result in chronic bronchitis (支气管炎) and emphysema (肺气肿), but this has yet to be proven.
Recently an association has been found between the levels of particles in the air and death rates in North American cities. The reason for this association is not understood and as yet there is no evidence this occurs in Australia. However, we do know that hazy days are associated with more asthma attacks in children.
The relationship between exposure to ______ has not yet been determined.
选项
A、ozone and fall in lung function
B、ozone and lung diseases such as asthma
C、nitrogen dioxide and worse lung function
D、smog and chronic bronchitis and emphysema
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/CP1O777K
0
考博英语
相关试题推荐
Rifleshootinghasbecomeafavoritediversionofcitydwellersnowadays,andgroupsofpeopleorganizeweekendtarget-shootinge
Dogsaresocialanimalsandwithoutpropertraining,theywillbehavelikewildanimals.Theywillspoilyourhouse,destroyyo
Thewidelypublicizeddemonstrationdidnotafterall____.
Frenchareelegantpeople.Theyareartistsineverydaylife,havingaverygoodtasteineverything.Theydon’tlikeAmericant
Sincetheearlynineties,thetrendinmostbusinesseshasbeentowardon-demand,always-availableproductsandservicesthatsu
Theanimalswouldchargenomatterhowbadlywounded,andintheirdeathstruggles.bellowingandrollingfromsidetoside,theys
Duringthenormaldevelopmentofself,achildisaffectedbycertaininfluentialfactors.(1)Infantsformanattachmentwitht
Duringthenormaldevelopmentofself,achildisaffectedbycertaininfluentialfactors.(1)Infantsformanattachmentwitht
Themajorityofpeople,aboutnineoutoften,areright-handed.【71】untilrecently,peoplewhowereleft-handedwereconsidered【
随机试题
作为国际政治基本行为主体的主权国家必须具备的基本要素有______、______、______、______。
自我管理包括哪些内容?
《我愿是一条急流》一诗的独特艺术手法是
Sally’sscoreontheexamisthelowestintheclass.She______hard.
某肉鸡场35日龄鸡发病,病鸡表现精神沉郁、羽毛松乱,死亡病鸡的肉眼病变主要有纤维素性心包炎、纤维素性肝周炎和纤维素性气囊炎。使用抗菌素治疗后效果良好。该病最可能是
对资产负债表中流动资产和流动负债进行比较,可以反映企业的长期偿债能力。()
抢劫罪:是指非法占有为目的,以暴力、胁迫或者其他方法,强行劫取公私财物的行为。根据上述定义,下列行为属于抢劫罪的是()。
“不登高山。不知天之高也;不临深渊,不知地之厚也。”这说明
Justhowdoesapersonarriveatanideaofthekindofpersonthatheis?Hedevelopsthis(1)_____ofselfthroughagraduala
JeniseHoke
最新回复
(
0
)