首页
登录
职称英语
It didn’t happen overnight. The problem of polluted air has been festering f
It didn’t happen overnight. The problem of polluted air has been festering f
游客
2025-04-06
13
管理
问题
It didn’t happen overnight. The problem of polluted air has been festering for centuries.
Suddenly the problem of air pollution is becoming critical and is erupting right before our eyes. Not only do our eyes burn as they focus through murky air, but when the air clears, we see trees and vegetation dying. We must realize that this destruction can no longer be pinned to some mysterious cause. The one major culprit is air pollution.
Today’s air pollution is an unfortunate by-product of the growth of civilization. Civilized man desires goods that require heavy industrialization and mass production. Machines and factories sometimes pollute and taint the air with substances that are dangerous to man and the environment. These substances include radioactive dust, salt spray, herbicide and pesticide aerosols, liquid droplets of acidic matter, gases, and sometimes soil particles. These materials can act alone to irritate objects and forms of life. More dangerously, they join together to act upon the environment. Only lately have we begun recognizing some of their dangerous consequences.
Scientists have not yet been able to obtain a complete report on the effects of air pollution on trees. They do know, however, that sulfur dioxide, fluorides, and ozone destroy trees and that individual trees respond differently to the numerous particulate and gaseous pollutants. Sometimes trees growing in a single area under attack by pollutants will show symptoms of injury or will die while their neighbors remain healthy. Scientists believe this difference in response depends on the kind of tree and its genetic makeup. Other factors, such as tree’s stage of growth and nearness to the pollution source, the amount of pollutant, and the length of the pollution attack also play a part. In short, whether or not a tree dies as a result of air pollution depends on a combination of host and environment factors.
For the most part, air pollutants injury trees. To conifers, which have year-round needles, air pollution causes early balding. In this event, trees cannot maintain normal food production levels. Undernourished and weakened, they are open to attack by a host of insects, disease, and other environmental stresses. Death often follows.
Air pollution may also cause hardwoods to lose their leaves. Because their leaves are borne only for a portion of the year and are replaced the following year, air pollution injury to hardwoods may not be so severe. [br] The author attributes today’s air pollution to .
选项
A、the growth of civilization
B、man’s carelessness
C、environmental imbalance
D、some mysterious cause
答案
A
解析
细节事实题。根据题干关键词today’s air pollution定位到原文第三段首句。原句中的the growthof civilization与选项A对应。故答案为A。
转载请注明原文地址:https://tihaiku.com/zcyy/4029764.html
相关试题推荐
Itdidn’thappenovernight.Theproblemofpollutedairhasbeenfesteringf
Itdidn’thappenovernight.Theproblemofpollutedairhasbeenfesteringf
Itdidn’thappenovernight.Theproblemofpollutedairhasbeenfesteringf
Thebasicstructuralreasonforthisproblemisthatinformationproductsarech
Aterribletrafficaccidenthappened;peopleweresaddenedwhentheywatchedthe
Whenthepressreleasearrivedinourinboxes,weknewwhatwouldhappennex
Whenthepressreleasearrivedinourinboxes,weknewwhatwouldhappennex
Yourkindnessingiving______totheconsiderationoftheaboveproblemwillbe
Itdidn’thappenovernight.Theproblemofpollutedairhasbeenfesteringf
Itdidn’thappenovernight.Theproblemofpollutedairhasbeenfesteringf
随机试题
Thisisofferedasatextbookillustrationoftheprinciplethatvotersare
Hehassuchabigheartthatheneverrefusesto____________(给需要帮助的人伸出援助之手).len
[originaltext]Tokyoisoneofthoseplacesthatyoucanloveandhateatth
关于出版活动中的“复制”,下列表述中错误的是( )。A.在商品经济条件下,复制
在移动互联网、大数据、云计算等科技不断发展的背景下,对市场、对用户、对产品、对企
社区机械性资源不包括下列哪一项A.疗养院 B.医院 C.专家及领导人员 D
我国现行房地产经纪行业管理中,通过( )的建设,可以提升房地产经纪人的职业道德
A.结晶紫B.碘化钾-淀粉C.荧光黄D.酚酞E.邻二氮菲亚硝酸钠法所用的指示液是
穿好手术衣后,手应该放置的正确位置是A:上举至双肩以上,下垂至腹部 B:上举至
支气管哮喘发作,呼吸困难加重时,肺内哮鸣音反而减轻或消失。其原因可能是A.黏液栓
最新回复
(
0
)