首页
登录
职称英语
[originaltext] Scientists in the United States have reported some good news
[originaltext] Scientists in the United States have reported some good news
游客
2023-09-13
40
管理
问题
Scientists in the United States have reported some good news about the ozone in the atmosphere. Recent findings suggest that the destruction of ozone by pollution is slowing. Ozone is a form of oxygen. Its presence above Earth protects us from radiation from the sun.
In one study, researchers examined information gathered by NASA space agency satellites and by equipment on Earth and said the atmosphere was losing about eight percent of the ozone layer per ten- year period since the late 1970s. In the last five years, though, that rate of loss has dropped by half. The atmosphere should start to gain ozone before long. A full recovery, however, is about 50 years away, as long as the Montreal Protocol remains in place.
That is an international treaty from 1987 to restore the ozone layer. The treaty restricts the use of a number of chemicals that destroy ozone, like chlorofiuorocarbons, or C-F-C’s. Wide use of C-F-C’s began in the 1930s. They became popular coolants in devices such as refrigerators and air conditioners. C-F-C’s remain in the atmosphere for years.
The Montreal Protocol also restricts the use of methyl bromide, a chemical to kill insects. Farmers and shippers are the main users. Natural sources of methyl bromide include oceans and some plants. Scientists say the bromine gas it produces is 50 times more destructive to ozone than chlorine gas from C-F-C’s.
选项
A、To restore our atmosphere.
B、To stop refrigerator-use.
C、To prevent people from killing insects.
D、To restrict the use of some pollutants that harm the ozone layer.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3010860.html
相关试题推荐
[originaltext]Faces,likefingerprints,areunique.Didyoueverwonderhow
[originaltext]Faces,likefingerprints,areunique.Didyoueverwonderhow
[originaltext]Faces,likefingerprints,areunique.Didyoueverwonderhow
[originaltext]InBritainthereare11nationaldailynewspapersandmostpe
[originaltext]M:Goodafternoon.IhaveanappointmentwithMissKarliatfour
[originaltext]M:Goodafternoon.IhaveanappointmentwithMissKarliatfour
[originaltext]M:Goodafternoon.IhaveanappointmentwithMissKarliatfour
[originaltext]M:TellmeMrs.Clark,Nowdidyoucometobeabeardedlady?W.
[originaltext]M:TellmeMrs.Clark,Nowdidyoucometobeabeardedlady?W.
[originaltext]W:Didyousayyouweredrivingtothetownthismorning?M:Yes,
随机试题
NapoleonwaswrongwhenhedismissedtheBritishasanationofshopkeepers
DaydreamingI.Daydreamingcanbeharmfulbecauseit
Thetaskofbeingacceptedandenrolledinauniversitybeginsearlyforso
Whatistheconversationmainlyabout?[originaltext]W:Hi,Mark,it’saprettyg
Theyshouldadoptamore_____approachandinvestigatealternativeusesforthe
[originaltext]M:Wherewereyoulastnight?W:Iwasinallevening.Thephone
Thefollowingisalistoftermsusedinrailroadservices.Afterreadingit,yo
利用施密特正交化方法把向量组a1=(1,0,-1,1),a2=(1,-1,0,
下列以划拨方式取得土地使用权期限的表述中,何者是正确的?( )A.使用期限为四
患者男,30岁。发热、出血、贫血、齿龈增生,全血细胞减少,骨髓增生极度活跃,原始
最新回复
(
0
)