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
2014-01-07
63
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.
"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 just underneath its surface.(By comparison, Venus isn’t even that interesting to look at: A boring cue ball 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 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.
Some planetologists believed there had never been lives on Venus because
选项
A、they couldn’t find any trace of water on it.
B、they found Venus is too hot for any lives.
C、Venus is covered by dirty and poisonous cloud.
D、the atmospheric pressure on Venus is too much.
答案
A
解析
文中多处从正面和反面表明,一些科学家相信Venus上没有生命是因为那里没有水。正面的依据如第5段开头两句及最后一段;反面的依据如第3段中的那个研究地球高级生命形式的小团体对认为Venus上没有生命的看法的驳斥;由此可见,本题答案应为A。
转载请注明原文地址:https://kaotiyun.com/show/3kFK777K
0
专业英语四级
相关试题推荐
HappyFourthofJuly!MostpeopleareprobablyawareofthesignificanceofJuly4toAmericans./Theymightnothowever,b
Whydothechangesinclimateoccur?
Mostpeoplehaterockmusic.【C1】______Iamnotanunreasonableorbiasedperson【C2】______nature,twovividandstriking【C3】____
Somethingisgoingoninthestepmotheringcamp.Callitanuprising,orarebranding.TherewasthestoryaboutthewomaninAu
ThereportissuedbytheKaiserFamilyFoundationmainlyshowsthat
Thewordhugisofuncertainorigin.TheOxfordEnglishDictionarycautionsagainstconfusingitwithhugge—avariantoftheMid
Theiow-cost’carrierraisedpricesby13%inthefirsthalf.Istheeraofcheapflightsnowover?Ryanairhasonesimplem
Thestudentshaveexpectedforthewinterholidaysfortheywanttoexperiencethefeelingthatworkis______intomoney.
Inwinterdrivershavetroublestoppingtheircarsfrom______onicyroads.
WhydidSpringsellhisfalseautographsinEnglandandCanada?
随机试题
语法是语言的_____法则,专指组成词、短语、句子等_____的语言单位的规则。
论述国际市场营销规划。
何谓巴斯德(巴氏)消毒法?
散剂优点不包括
A.肾上腺皮质腺瘤B.Cushing病C.Addison病D.单纯性肥胖E.肾上腺皮质腺癌可被小剂量地塞米松抑制
质量管理包括制定质量方针和质量目标以及()。
一般存款账户可以办理现金缴存和现金支取。()
我国中央政府于()年开始实施西部大开发战略。
"Howdidyoudoit,Dad?Howhaveyoumanagedtonottakeadrinkforalmost20years?"Ittookmealmost20yearstohavethe【C1
在审理王某诉李某债务纠纷案件中,某市中级人民法院依据最高人民法院《关于适用(中华人民共和国婚姻法)若干问题的解释(二)》第二十四条关于夫妻共同债务认定的规定,作出了终审判决。当事人李某认为,该规定同法律相抵触,向全国人大常委会书面提出了审查建议。
最新回复
(
0
)