首页
登录
职称英语
1 In the second half of the 20th century, the world became, quite literally, a d
1 In the second half of the 20th century, the world became, quite literally, a d
游客
2023-11-19
43
管理
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." [br] The following are suspected causes of global dimming EXCEPT ______.
选项
A、soot particles in the air
B、darker sun
C、more water droplets in the air
D、thicker, darker clouds
答案
B
解析
第8段中此句“the sun remains as bright as ever,”表明,B不是全球变暗的原因。其它各项可在下文找到。
转载请注明原文地址:https://tihaiku.com/zcyy/3199892.html
相关试题推荐
What’sthechangeinAmericanfamilyinthe21century?[br][originaltext]A
Gunpowderwasdiscoveredinthetwelfthcentury,but_________.A、mandidnotput
Mr.Smithbecamevery______whenitwassuggestedthathehadmadeamistake.A、
Bythemiddleofthe21stcentury,thevastmajorityoftheworld’spopulation_
Nancybecameataxidriverbecause______.[br][originaltext]Interviewer:Hell
Nancybecameataxidriverbecause______.[br][originaltext]Interviewer:Hell
Justafewsecondsoffrenziedpassiononthefloorofthepublicbarandt
Justafewsecondsoffrenziedpassiononthefloorofthepublicbarandt
Soonafterthedrug______effect,thepatientbecamequieter.A、broughtB、madeC
AccordingtoMartin,livinginthe19thcenturywouldhavebeenaverynicethin
随机试题
Traditionally,theAmericanfarmerhasalwaysbeenindependentandhard-workin
Indiansaregenerallyreligiousandfamilyoriented,andtheirlivesaredee
Toronto,Canada,islocatedontheshoreofLakeOntario,withdirectflightto
关于法的效力层级的说法,正确的是( )。A.行政法规的法律地位仅次于宪法 B
下列属于单侧平衡的是A.侧方平衡 B.前伸平衡 C.正中平衡 D.尖牙保护
女性,48岁。慢性腹泻3年,大便每日3~4次,伴有少量黏液,多次粪便致病菌培养阴
甲乙两国签署了贸易、通商等若干双边协定,乙国新《对外贸易管理法》出现了与两国条约
制作可摘局部义齿印模选择的托盘时,要求托盘的侧翼与牙弓内外侧应有的间隙是A.1.
柯达公司是世界上最大的影像产品及相关服务的生产商和供应商。柯达公司在影像拍摄、
信贷额度是银行具有法律义务地提供不超过某一最高限额的贷款协定。()
最新回复
(
0
)