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
39
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
PASSAGETWOPossiblechangesnanotechnologywillbringtous.主旨大意题。文章主要阐述了纳米技术对解决
Caffeinewillgetyougoingduringthedaybutcouldleaveyoutossingandt
[originaltext]W:Oh,Steve,you’reearly!I’mhappyyou’rehereearlytodaybec
下列情形(),当事人可以按照约定申请不动产预告登记。A.商品房等不动产预售
下列选项中,不是总监职责的是()。A.主持编写工程项目监理规划 B.参与工
检测检构参加部组织的比对试验中连续2次出现?不满意结果,要降低机构等级。()
下列疾病可以使用冷疗的是A.周围血管病变 B.软组织损伤后期 C.软组织损伤
安装时间超过()的电容器户外用高压熔断器(外熔断件)应进行更换。1年$;$3年$
2019年前三季度,我国软件业完成软件业务收入51896亿元,同比增长1
下列属于组合体系桥梁的是()A.钢管混凝土拱桥 B.斜拉桥 C.桁架拱
最新回复
(
0
)