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
20
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.
When did ozone problems first become known?
选项
A、In 1985.
B、In 1987.
C、In 1986.
D、In 1988.
答案
A
解析
细节题。文章第二段第一句就指出人们首次认识臭氧是在1985年,在1987年人们首次发现了臭氧层空洞,故应选A。
转载请注明原文地址:https://kaotiyun.com/show/eIxd777K
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?
Wesometimesthinkhumansareuniquelyvulnerabletoanxiety,butstressseemstoaffecttheimmunedefensesofloweranimalsto
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesamelife【21】______commontoallanimals.Inabio
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesamelife【21】______commontoallanimals.Inabio
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesamelife【21】______commontoallanimals.Inabio
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
营养配餐教师应依据教学的需要,结合学生的实际和_______,补充必要的新材料,使教学保持先进性、创造性,保证教学有较新、较高的水平。
静脉切开一般输液导管可保留__________天,硅胶管可保留__________天左右。
关于慢性硬脑膜下积液引流术后正确的护理措施是
直流系统绝缘监测装置的测量准确度应不低于()。
城市总体规划、村庄和集镇规划涉及()的,调整前必须报请原审批机关认可,经认可后方可调整。
上市公司公开发行新股,应满足的条件之一是()。
“高山流水”是任何人都极为欣赏的古典音乐,而每个人对任何一种古典音乐的态度是要么着迷,要么不欣赏。由此可见()。
联合国大会通过的《儿童权利公约》所确定的保护儿童的基本原则不包括()。
若x,y是有理数,且满足,则x,y的值分别为().
(1)Therobotsinmoviesandsciencefictionbooksthatriseuptotakeovertheworldgenerallyareabletodosobecauseweha
最新回复
(
0
)