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
Ozone is a form of oxygen. It is found in the air we breathe and in the upper atmosphere. Near the Earth, ozone in the air is a
Ozone is a form of oxygen. It is found in the air we breathe and in the upper atmosphere. Near the Earth, ozone in the air is a
admin
2010-08-07
24
问题
Ozone is a form of oxygen. It is found in the air we breathe and in the upper atmosphere. Near the Earth, ozone in the air is a danger to life because it is a pollutant. But between ten and fifty kilometers up in the atmosphere, ozone protects life on the Earth. Ozone forms in the atmosphere through the action of radiation from the sun. Ozone blocks harmful radiation from reaching the Earth. Scientists say a decrease in ozone and an increase in the harmful radiation will cause many more cases of skin cancer. And it will harm crops, animals and fish.
Ozone problems first became known in 1985. British scientists reported that ozone levels in the Antarctic atmosphere near the South Pole fell sharply each year in October and November. 1987 was the first year that a huge hole developed in the ozone layer above the Antarctic.
A recent study of the atmosphere over the Arctic area near the North Pole showed extreme thinning of the ozone. Officials from the American space agency said the latest study is a result of the largest campaign yet to measure ozone amounts and changes in the Arctic area. NASA researcher Paul Newman said some of the measurements show ozone in the Arctic decreased about sixty percent between January and the middle of March. These measurements are similar to the ozone losses observed in this area a few years ago.
Other studies have shown that man-made chemicals were destroying ozone in the atmosphere. An international agreement halted production of the most harmful chemicals. The new findings support the idea that recovery of the ozone layer may be delayed.
Ozone is______.
选项
A、harmful
B、a form of oxygen
C、rare
D、oxygen
答案
B
解析
细节题。文章第一段第一句就告诉我们臭氧是氧气的一种,但并不等同于氧气,故 D不正确,根据常识可知A、C是不正确的,故应选B。
转载请注明原文地址:https://kaotiyun.com/show/aIxd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Inthewriter’sopinion,peoplejudgeothersbyWhatadvantagesdoesthewritersaymanagershaveoverotherworkers?
HumanintelligenceandtheIQscalesusedtomeasureitonceagainarebecomingthefocusoffierydebate.Asargumentrages
HumanintelligenceandtheIQscalesusedtomeasureitonceagainarebecomingthefocusoffierydebate.Asargumentrages
ItiscommonlybelievedintheUnitedStatesthatschooliswherepeoplegotogetaneducation.Nevertheless,ithasbeensaid
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesamelife【21】______commontoallanimals.Inabio
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesamelife【21】______commontoallanimals.Inabio
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesamelife【21】______commontoallanimals.Inabio
随机试题
请你举出四种食品新技术。
“州都之官”是( )。
新加坡国际金融期货交易所(SIMEX)的期货品种具有典型的离岸金融衍生品的特征。()
可以用来量化收益率风险或者收益率波动性的指标有()。
期量标准,是指为加工对象在()和()方面规定的标准数据。
A公司于2013年6月在上海证券交易所上市。2017年4月,A公司聘请B证券公司作为向不特定对象公开募集股份(以下简称“增发”)的保荐人。B证券公司就本次增发编制的发行文件有关要点如下:(1)A公司近3年的有关财务数据如下:A公司于2014年度以资本公
简述练习过程的一般规律。
设函数f(x,y)在点(0,0)处连续,且(1)求,并讨论它们在点(0,0)处是否可微,若可微求出df(x,y)|(0,0);(2)证明:f(x,y)在点(0,0)处取得极小值.
DearBrainStoreCustomer,Wehopeyouenjoyedbooksandotheritemsincludedinourcatalogue(目录).Whetheryou’reateacher
There’ssomethingrotteninthestateofwomen’shealth.AsthisarticleisbeingwritteninJuly,RepublicansinCongressare【C
最新回复
(
0
)