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
If our solar system has a Hell, it’s Venus. The air is choked with foul and corrosive sulfur, heaved from ancient volcanoes and
If our solar system has a Hell, it’s Venus. The air is choked with foul and corrosive sulfur, heaved from ancient volcanoes and
admin
2016-04-30
55
问题
If our solar system has a Hell, it’s Venus. The air is choked with foul and corrosive sulfur, heaved from ancient volcanoes and feeding acid clouds above. Although the second planet is a step farther from the sun than Mercury, a runaway greenhouse effect makes it hotter indeed It’s the hottest of the nine plants, a toasty 900 degrees Fahrenheit of baking rocky flats from equator to poles. All this under a crushing atmospheric pressure 90 times that of where you’re sitting now. From the earthly perspective, a dead end. It must be lifeless.
"Venus has nothing," is the blunt word from planetologist Kevin Zahnle of NASA Ames Research Center in California’s Silicon Valley. "We’ve written it off."
Yet a small group of advanced life-forms on Earth begs to differ, and theorizes that bizarre microbial ecosystems might have once populated Venus and, in fact, may be there still. Members of this loose band of researchers suggest that their colleagues have water too much on the brain, and are, in a sense, H
2
O chauvinists(盲目的爱国者).
"Astrobiologists are neglecting Venus due more to narrow thinking than actual knowledge of the environment, or environments, where life can thrive," says Dirk Schulze-Makuch, a geobiologist at the University of Texas at El Paso who recently co-authored a Venus-boosting paper in Astrobiology with colleague Louis Irwin.
The bias against life on Venus is partly rooted in our own biology. Human experience instructs that liquid water, preferably lot of it, is essential for life. In search for extraterrestrial life, we obsess over small rivers in Mars’ surface apparently carved by ancient gushes of water, and delight in hints of permafrost(永久冻结带)just underneath its surface.(By comparison, Venus isn’t even that interesting to look at: A boring cue ball(台球的白色母球)for backyard astronomers, its clouds reflects 75% of visible light.)Attention and then funding follow the water: Three more landers will depart for Mars this spring, and serious plans for sample-return missions hover in the midterm future.
"If you have limited resources, you base exploration on what you know," says Arizona State University planetary geologist Ronal Greeley. It’s like losing your keys on the way home at night: The first place you look is under the streetlights not because they’re more likely to be there, but because if they are, you’ll spot them. For astrobiologists, the streetlights are the spectral(光谱的)lines for water, and they’ve spotted that potential on Mars, Jupiter’s moon Europa, even Neptune’s moon Triton. Not on the baking rocky flats of Venus.
Venus is the hottest of all the nine planets in the solar system because______.
选项
A、it is not so close to the sun as Mercury
B、many volcanoes spread the whole planet
C、it is covered by a thick layer of cloud
D、greenhouse effect is uncontrollable on it
答案
D
解析
从首段第3、4句可以推断,金星比其他行星都热,是因为温室效应肆虐,因此本题选D。A关于金星离太阳的距离,B关于金星上的火山,C关于覆盖金星的云层,都在这一段中提到,虽然按照常理,这些因素都可能使某个地方的温度上升,但它们均无原文依据,故可排除。
转载请注明原文地址:https://kaotiyun.com/show/HtG7777K
0
大学英语六级
相关试题推荐
YouDon’tHavetoBe18:GoingtoCollegeasanAdultA)Everysooften,especiallywhenI’mfeelingdown,Itakeoutmyoldcoll
Mostpeopledon’tenjoyfacingthedifficultsituationsthatsometimesoccurwithcoworkersintheworkplace.Suchsituationsma
FilmSchoolsA)Filmschoolsandfilmdirectingschoolsprovideaspiringfilmstudentswithasolidunderstandingofthemanyfac
TheAmericaneconomicsystemisorganizedaroundabasicallyprivateenterprise.It’s【B1】______economyinwhichconsumersdeterm
A、AwarbetweenBritainandtheUnitedStates.B、AsmallbattlebetweentheAmericanandtheBritishtroops.C、TalksbyGeneral
AnneHechehasprovenherselfanexceptionalactressinfilm,televisionandstage.Hertalentshaveearnedhercriticalpraise
茶马古道(Tea-horseAncientRoad)两边,生活着20多个少数民族。不同的地方有着各自美丽而神奇的自然风景和传统文化,比如:大理古城、丽江古城、香格里拉(Shangrila)、雅鲁藏布大峡谷和布达拉宫(PotalaPalace)。古道的
A、Nomedicinecouldsolvethewoman’sproblem.B、Thewomanshouldeatlesstolosesomeweight.C、Nothingcouldhelpthewomani
A、Cooperationandconcession.B、Equalityandmutualbenefit.C、Exchangingdailynecessities.D、Introducingadvancedtechnology.
A、Healthconditionsimprovewithtimespentwatchinghealthyprograms.B、Comedyvideoscancuremostpeopleofchronicheartatt
随机试题
Whathavepeoplediscoveredabouthobbies?Hobbiescanbeprofitableand_________________________________
体重指数(BMI)的计算
下列药物在制备水丸时,应制成药汁的是
患者分娩后失血过多,突然晕眩,面色苍白,心悸,愦闷不适,渐至昏不知人,眼闭口开,甚则四肢厥冷,冷汗淋漓,舌淡无苔,脉微欲绝。诊断为
女性,40岁。已确诊Graves病,以下哪项表现最具有诊断意义
下列工况中,选用低氢型焊条的有()。
展示学校的办学宗旨和特色的课程是()。
幼儿期,幼儿大量使用的判断是()
A、 B、 C、 D、 A
Humansareforeverforgettingthattheycan’tcontrolnature.Exactly20yearsago,amagazinecoverstoryannouncedthat"scien
最新回复
(
0
)