首页
登录
职称英语
Although there is considerable debate over how severe the greenhouse effect
Although there is considerable debate over how severe the greenhouse effect
游客
2023-07-30
13
管理
问题
Although there is considerable debate over how severe the greenhouse effect will be, one thing seems certain: carbon dioxide (二氧化碳) levels are on the rise. Measurements at the federal atmospheric observatory on Manna Loa volcano in Hawaii show that the concentration of the gas in the atmosphere has risen steadily from 315 parts per million in 1958 to 340 parts per million today.
The event offender, scientists conclude, is the burning of coal, oil, synthetic fuels, and natural gas. These carbon-rich fossil (从地下采掘的) energy sources release an estimated five and a half billion tons of carbon into the atmosphere each year as colorless, odorless (无味的) CO2 gas.
The increased carbon dioxide is probably not a threat to health, since normal indoor levels of the gas can run 1000 parts per million or higher without apparent harm. But it could deeply affect the way the earth is heated by the sun. The sun’s energy strikes the earth principally in the form of visible light. As the earth heats up, it radiates this energy back into space, but at the much longer wavelengths of infra- red (红外线的) light, or heat. Carbon dioxide lets the visible light pass through, but absorbs energy at infra-red wavelengths. Thus, the more carbon dioxide in the atmosphere, the more the earth’s heat is blocked from escaping --just as a blanket holds in the heat of a sleeper’s body.
Some scientists think the greenhouse effect already has begun: average global temperatures have risen about one degree Fahrenheit in the past 90 years. Others argue that the rise could be due to the irregular change of natural temperature. [br] Carbon dioxide is now a threat to ______.
选项
A、people staying indoors
B、people in poor health
C、the earth’s vegetation
D、the earth’s temperature
答案
D
解析
此题问二氧化碳主要对什么产生影响。第三段最后一句 “…the more the earth’s heat is blocked from escaping”,因而D是答案。其他三项均不符合题意。
转载请注明原文地址:https://tihaiku.com/zcyy/2881094.html
相关试题推荐
Althoughmuchremainedunaltered,_________(不容否认)thatsomesignificantchanges
Peoplewhoarehitbylightningandsurviveoftenhavelong-termeffects.Thes
Peoplewhoarehitbylightningandsurviveoftenhavelong-termeffects.Thes
Peoplewhoarehitbylightningandsurviveoftenhavelong-termeffects.Thes
Peoplewhoarehitbylightningandsurviveoftenhavelong-termeffects.Thes
Peoplewhoarehitbylightningandsurviveoftenhavelong-termeffects.Thes
Peoplewhoarehitbylightningandsurviveoftenhavelong-termeffects.Thes
Peoplewhoarehitbylightningandsurviveoftenhavelong-termeffects.Thes
Peoplewhoarehitbylightningandsurviveoftenhavelong-termeffects.Thes
Peoplewhoarehitbylightningandsurviveoftenhavelong-termeffects.Thes
随机试题
足球比赛中双方争抢头顶球造成前额出血,应指压哪一部位进行止血?()A.肱动脉
一个合同被法院确认为可撤销合同。甲、乙双方约定的违约金为4万元,合同履行阶段双方
下列不属于物理灭菌方法的是A.紫外线灭菌 B.微波灭菌 C.甲醛蒸汽熏蒸
质量是指一组固有特性满足要求的程度。其中“满足要求”是指满足( )的要求。
甾体激素是一类稠合四环脂烃化合物,以下有关说法错误的是A.具有环戊环并多氢菲母核
智能辅助设施平台竣工(预)验收中,哪些设备应与视频监控系统联动()。消防系统$;
2013年12月14日21时11分,探测器在月球表面预选着陆区域
在皮某故意伤害一案中,被害人鞠某打算就附带民事诉讼赔偿事宜委托景某作为代理人,下
A.虫蛀、霉变 B.吸湿、风化 C.结块、发霉 D.粘连、软化 E.糖易
注册会计师在测试乙公司与采购交易相关的内部控制时发现下列情况,其中最可能表明采购
最新回复
(
0
)