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
Most scientists blame people, at least in part, for global warming. Now, some researchers say people may be partly to blame for
Most scientists blame people, at least in part, for global warming. Now, some researchers say people may be partly to blame for
admin
2010-01-07
83
问题
Most scientists blame people, at least in part, for global warming. Now, some researchers say people may be partly to blame for the cooling of Antarctica as well.
While average global temperatures have risen about one degree Fahrenheit over the past century, Antarctica over all appears to have cooled slightly in the past few decades. That has been puzzling, because the polar regions are thought to be more sensitive to warming trends than the rest of the globe. Even more puzzling, a small portion of Antarctica--the peninsula that stretches north toward South America--defies the cooling trend. It has been warming very rapidly, about five degrees over the past 50 years, 10 times the global average.
Writing in today’ s issue of the journal Science, Dr. David Thompson, a professor of atmospheric science at Colorado State University, and Dr. Susan Solomon, a senior scientist at the National Oceanic and Atmospheric Administration in Boulder, Colo., argue that the ozone hole, which has opened up each spring over Antarctica in recent years, may help explain both contradictory trends.
A vortex of winds continually blows around Antarctica, tending to trap cold air at the South Pole. In the new paper, Dr. Thompson and Dr. Solomon show that the winds have strengthened in the past few decades, keeping the cold air even more confined. The peninsula, which lies outside the wind vortex, escapes the cooling effect, the scientists said. They say the ozone hole may be the cause of the stronger winds.
Close to the ground, ozone, a molecule consisting of three oxygen atoms, forms a large and unhealthy component of smog. High in the atmosphere, however, nature occurring ozone is essential for life, blocking ultraviolet rays that would fatally mangle DNA. However, fewer ozone molecules mean the atmosphere absorbs less ultraviolet radiation. Instead of warming the air, the rays bounce off the snow and ice of Antarctica and reflect back into space.
Scientists already knew that the ozone hole had cooled the upper atmosphere. Dr. Thompson and Dr. Solomon show that the troposphere, the lowest six miles of the atmosphere, has also cooled. "It’ s a lot of food for thought in there," said Dr. John Walsh, a professor of atmospheric science at the University of Illinois and an author of a paper in Science in January that indicated Antarctica was cooling. He noted that the ozone hole was usually largest in November or December, but that the greatest cooling had been about six months later.
The author of the passage is mainly concerned with ______ .
选项
A、the trend of global warming because of the ozone hole
B、the warming trend in Antarctica because of the ozone hole
C、the cooling trend in Antarctica because of the ozone hole
D、the warming trend in the peninsula that stretches north toward South America
答案
C
解析
从文章第一段即可看出。
转载请注明原文地址:https://kaotiyun.com/show/juPd777K
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
Besidesthefunctionsasavitalentertainmentmedium,whatelsecanpeopleuseaTVas?
Moreandmorepeoplearecomplainingabouttheirheavierandheavierpressurefromworkandlife,andtheyhavebecomemoreand
Someyoungmarriedcouplesarechoosingnottohavechildren,becausetheythinkthatchildrenbringthemmoremiserythanjoy;
SomepeopleusedtosaythatDadhadsomanychildrenthathecouldn’tkeeptrackofthem.Dadhimselfusedto【1】astoryabouto
SomepeopleusedtosaythatDadhadsomanychildrenthathecouldn’tkeeptrackofthem.Dadhimselfusedto【1】astoryabouto
Managersspendagreatdealoftheirtimeinmeetings.AccordingtoHenryMintzberg,inhisbook,TheNatureofManagerialWork,
Managersspendagreatdealoftheirtimeinmeetings.AccordingtoHenryMintzberg,inhisbook,TheNatureofManagerialWork,
AnswerQuestions71to80byreferringtothecommentson4differentcarmodelsinthefollowingmagazinearticle.Answereach
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
随机试题
试述楚辞的渊源及其文体特点。
某企业有某一低值易耗品,原价1000元,预计可使用8个月,至评估基准日已使用2个月,评估基准日该低值易耗品的市价为800元,则该低值易耗品的评估值为()
用盐酸滴定液滴定氨水时,使用的指示剂是
前颅底骨折特点
关于佛教、道教、伊斯兰教,说法错误的是()。
社会工作研究的范式包括()。
《秋千》《浴女》等绘画作品的作者,是18世纪__________国画家__________。
Theexperimentconductedbytheresearcherwasmeantto______.Whatisoneofthepossibleconclusionsoftheexperiment?
下列关于数据仓库的叙述中,哪一项是不正确的?______
Ittookmeexactlyaweektocompletethework.
最新回复
(
0
)