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
1 In the second half of the 20th century, the world became, quite literally, a darker place. 2 Defying expectation and easy expl
1 In the second half of the 20th century, the world became, quite literally, a darker place. 2 Defying expectation and easy expl
admin
2010-04-24
57
问题
1 In the second half of the 20th century, the world became, quite literally, a darker place.
2 Defying expectation and easy explanation, hundreds of instruments around the world recorded a drop in sunshine reaching the surface of Earth, as much as 10 percent from the late 1950’s to the early 90’s, or 2 percent to 3percent a decade. In some regions like Asia, the United States and Europe, the drop was even steeper. In Hong Kong, sunlight decreased 37 percent.
3 No one is predicting that it may soon be night all day, and some scientists theorize that the skies have brightened in the last decade as the suspected cause of global dimming, air pollution, clears up in many parts of the world.
4 Yet the dimming trend — noticed by a handful of scientists 20 years ago but dismissed then as unbelievable — is attracting wide attention.
5 "There could be a big gorilla sitting on the dining table, and we didn’t know about it," said Dr. Veerabhadran Ramanathan, a professor of climate and atmospheric sciences at the University of California, San Diego. "There are many, many issues that it raises."
6 Dr. James E. Hansen, director of the NASA Goddard Institute for Space Studies in Manhattan, said that scientists had long known that pollution particles reflected some sunlight, but that they were now realizing the magnitude of the effect.
7 "It’s occurred over a long time period," Dr. Hansen said. "So it’s not something that, perhaps, jumps out at you as a person in the street. But it’s a large effect."
8 Satellite measurements show that the sun remains as bright as ever, but that less and less sunlight has been making it through the atmosphere to the ground.
9 Pollution dims sunlight in two ways, scientists theorize. Some light bounces off soot particles in the air and goes back into outer space. The pollution also causes more water droplets to condense out of air, leading to thicker, darker clouds, which also block more light. For that reason, the dimming appears to be more pronounced on cloudy days than sunny ones. Some less polluted regions have had little or no dimming.
10 The dynamics of global dimming are not completely understood. Antarctica, which would be expected to have clean air, has also dimmed.
11 "In general, we don’t really understand this thing that’s going on," said Dr. Shabtai Cohen, a scientist in the Israeli Agriculture Ministry who has studied dimming for a decade. "And we don’t have the whole story."
What does the passage mainly discuss?
选项
A、Sunshine diminishes 10% to 37%
B、Why does the globe tend to dim?
C、Globe grows darker
D、Pollution dims sunlight in two ways
答案
C
解析
主旨题。在第一段首句。“In the second half of the 20th century, the world became, quite literally, a darker place”可找到答案。
转载请注明原文地址:https://kaotiyun.com/show/X12K777K
0
专业英语四级
相关试题推荐
What’sthechangeinAmericanfamilyinthe21century?
Educatortodayaremoreandmoreoften【C1】______tosaythatcomputerliteracyisabsolutelynecessaryforcollegestudents.Ma
Inancienttimespeoplewhowerethoughttohavetheabilityto________dreamswerelikelytobehighlyrespected.
Aneedforbeauty,lightness,corrosionresistance,orotherspecificpropertiesmustbepresentbeforeplasticcanbeconsidere
BywhatmeansdidJoethinkhecouldbecomerich?
Computerpeopletalkalotabouttheneedforotherpeopletobecome"computer-literate",inotherwords,tolearntounderstan
Itwasunusualforthere______sofewstudentsintheclassroom.
Thetrafficpolicecame______theaccidentoccurred.
Thenewteacherwasverynervous______shewaswellprepared.
Whencoal,the______ofplants,isburnt,chemicalenergyischangedintoheatenergy.
随机试题
关于中国工程咨询协会理事会职权的表述,不正确的是()。
按投资来源将工程项目分为()。
对于各工序的产出品和重要的部位,先由施工单位按规定自检,自检合格后,向咨询(监理)工程师提交(),经咨询(监理)工程师检验确认合格后,才能进入下一道工序施工。
对于任何一个具体的设备工程项目,尽管需要协调各个目标之间的关系,但往往是以某一目标为主要目标的。这说明设备监理的目标具有( )特点。
()是基础证券发行人或其以外的第三人(简称“发行人”)发行的,约定持有人在规定期间内或特定到期日,有权按约定价格向发行人购买或出售标的证券,或以现金结算方式收取结算差价的有价证券。
下列属于企业集团财务公司资产业务的有()。
导游人员与导游者的谈话内容一般不要涉及()。
请认真阅读下列材料,并按要求作答。请根据上述材料完成下列任务:依据拟定的教学目标,概述教学过程并说明设计意图。(20分)
各国刑法关于犯罪的概念,主要有哪些类型?
简述提存的概念和原因。
最新回复
(
0
)