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
The dark smoke that comes out of Stacks or from a burning dump contains tiny bits of solid or liquid matter. The smoke also cont
The dark smoke that comes out of Stacks or from a burning dump contains tiny bits of solid or liquid matter. The smoke also cont
admin
2013-01-24
51
问题
The dark smoke that comes out of Stacks or from a burning dump contains tiny bits of solid or liquid matter. The smoke also contains many gases, most of which cannot be seen. Altogether, they make up the serious problems of air pollution. In so many places it keeps us from seeing the sun, irritates our eyes, causes us to cough, and makes us iii.
Air pollution can spread from city to city. It even spreads from one country to another. Some northern European countries have had "black snow" from pollutants that have traveled through the air from other countries and have fallen with the snow. So air pollution is really a’ global problem.
Air pollution can kill babies, older people ,and those who have respiratory(呼吸道的) diseases. In London, in 1952,four thousand people died in one week as a result of a serious air-pollution episode. In 1948, in the small town of Donora, Pennsylvania, twenty people died in a four-day period of bad air pollution.
At levels often found in cities, air pollution increases the risks of certain lung diseases, such as emphysema ,bronchitis, and asthma. Of course, smoking and other factors help to cause these illnesses, too, but these cases have increased greatly during recent years as air pollution has become worse. Air pollution can cause both airplane and auto accidents because it cuts down visibility. There are other possible health dangers from air pollution that we don’t know much about. For example, scientists are trying to find out whether chemicals that reach us from the air may cause changes in our cells.
These changes might cause babies to be born with serious birth defects. Scientists are trying to learn how all the many chemicals we are apt to take into our bodies from air, water, food, and even medicines act together to affect our health and the way our bodies work. That is another reason why it is so important to begin to control pollution now instead of waiting until we learn all the answers.
Air pollution costs us a lot of money. It soils and corrodes our buildings. It damages farm crops and forests. It has a destructive effect on our works of art. The cost of all this damage to our government is astronomical. It would be much more worthwhile, both for us and for the environment, to spend our tax dollars on air pollution control.
Scientists have not yet determined ______.
选项
A、all of the effects of pollution on the human body
B、how pollution can be controlled successfully
C、when the atmosphere first became polluted
D、how to wash the black snow clean
答案
A
解析
根据文章的第四段中的There are other possible health dangers from air pollution that we don’t know much about,可以推知A为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/6qaO777K
0
专业英语八级
相关试题推荐
A、3millionB、7millionC、28millionD、40millionC
MargaretSpellings,thesecretaryofeducation,announcedapilotreformtotheNoChildLeftBehindAct(NCLB),GeorgeBush’se
DavidLandes,authorofTheWealthandPovertyofNations:WhySomeAreSoRichandSomeSoPoor,creditstheworld’seconomica
Inrecentyears,moreandmorecollegestudentshavebeenworkingintheirsparetime.Somepeoplethinkitaffectsstudents’st
TheoriginalAmericanflagcontains13horizontalstripesand13whitestarsarranged______tosymbolizeunityandequalityof
Thepastfewyearshavebeenbusyonesforhuman-rightsorganisations.Inprosecutingtheso-calledwaronterror,manygovernme
EducationalValuesLifeisratherhecticforstudentsduringthefirstweekatNorthAmericanuniversities.However,students
IfyouhavereallybeenstudyingEnglishforsolong,it’sabouttimeyouareabletowritelettersinEnglish.
Eversincethefamilymovedtothesuburbslastyear,theycouldhaveenjoyedbetterhealth.
TheavengerinthenovelTheScarletLetteris______.
随机试题
2型糖尿病患者最常见的死亡原因是()
3岁女孩,正常排尿间有滴尿现象,拟诊为输尿管开口异位,最有诊断价值的.辅助检查
A.仔猪大肠杆菌病B.仔猪沙门氏菌病C.仔猪梭菌性肠炎D.猪传染性胃肠炎E.伪狂犬病某猪场部分断奶仔猪咳嗽、有时呕吐,有的仔猪共济失调、间歇发生四肢痉挛,有的猪顽固性腹泻。病猪脑组织接种家兔,家兔出现奇痒死亡。该病可能是
患者黄某,往来寒热,胸胁满闷,呕吐不止,心下痞硬,大便秘结,舌苔黄,脉弦数有力。治宜选用()
施工索赔从索赔的目的来看可分为()。
在巷道掘进循环中占时最多的工序是()。
一组数据的最大值与最小值之差,也称为全距的是( )。
Whatdoesitmeantobeintelligent?Mostpsychologistsagreethatabstractreasoning,problemsolving,andtheabilitytoacqui
(2008上系分)某轴承厂有甲、乙、丙三个车间,各车间生产的轴承数量分别占全厂的40%、30%、30%,各车间的次品率分别为3%、4%、5%(正品率分别为97%、96%、95%)。以上叙述可以图示如下在图中,从“厂”结点出发选择三个车间产品的概
ConradHiltonreallywantedtobeabanker.Instead,hesuccessfullychangedthe【C1】______purchaseofaTexaslow-endhotelinto
最新回复
(
0
)