首页
登录
职称英语
The dark smoke that comes out of Stacks or from a burning dump contains tiny
The dark smoke that comes out of Stacks or from a burning dump contains tiny
游客
2023-12-12
39
管理
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. [br] 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://tihaiku.com/zcyy/3266731.html
相关试题推荐
TheoriginalAmericanflagcontains13horizontalstripesand13whitestarsarr
Lyingundertheskull,thehumanbraincontainsanaverageof______nervecellsc
Thedarksmokethatcomesoutofstacksorfromaburningdumpcontainstiny
Thedarksmokethatcomesoutofstacksorfromaburningdumpcontainstiny
Thedarksmokethatcomesoutofstacksorfromaburningdumpcontainstiny
Thedarksmokethatcomesoutofstacksorfromaburningdumpcontainstiny
TheSouthnowcontains______oftheAmericantextileindustry.A、90%B、80%C、0.7D
Thehumanbraincontains10thousandmillioncellsandeachofthemmayhave
Thehumanbraincontains10thousandmillioncellsandeachofthemmayhave
Whichofthefollowingpairscontainsphonemiccontrast?A、peat,peelB、pea,pee
随机试题
[img]2022m3x/ct_ve01202001m_eillist_0540_220329[/img][br][originaltext]Hello
Consumersarebeingconfusedandmisledbythehodge-podge(大杂烩)ofenvironmen
Nowastothematteroflying.Youwanttobeverycarefulaboutlying;other
不属于影响硅肺发病的因素是()A. B. C. D.个体因素 E.
行政事业单位会计是以权责发生制为基础。()
有关小腿慢性溃疡的手术治疗措施,下列不正确的是A.彻底清除局部坏死组织 B.肉
A.D细胞 B.主细胞 C.黏液细胞 D.壁细胞 E.G细胞胃黏膜中分泌
机体内环境的稳态是指 A.细胞内液理化性质保持不变B.细胞外液理化性质保持不
根据民事法律制度的规定,下列各项中,属于民事法律行为中的处分行为的是( )。A
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
最新回复
(
0
)