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
2019-06-23
78
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.
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、Venus is the second nearest planet to the sun
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段开头两句及末段;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/qyX7777K
0
大学英语六级
相关试题推荐
A、Itisabreakthroughinthestudyofthenervesystem.B、Itmaystimulatescientiststomakefurtherstudies.C、Itsresulthel
A、Theshapeofthecubesused.B、Thesizeoftheobjectsshown.C、Thenumberoftimesofrepeatingtheprocess.D、Theweightof
A、Movingfingersduringdreams.B、FeelingbetterontheInternet.C、Checkingemailsonline.D、Preferringsocialactivities.B
There’sGoldinThemthereLandfills[A]InthemovieWALL‘E,humankindhasleftEarthinabitofamess.Theplanetischoked
Cryingishardlyanactivityencouragedbysociety.Tears,betheyofsorrow,anger,orjoy,typicallymakeAmericansfeeluncom
Cryingishardlyanactivityencouragedbysociety.Tears,betheyofsorrow,anger,orjoy,typicallymakeAmericansfeeluncom
A、Thevalueofknowinghumanhistory.B、Theimportanceofsharinginformation.C、Howtobringbackthreatenedlanguages.D、Whye
A、English.B、Algebra.C、History.D、Spanish.B
A、ColonialAmericawasaplaceofdifferentpeoplesinhistory.B、Americansareeagertobuildmutualunderstandingquickly.C、C
LifeBeginsat100[A]Thisyear,thenumberofpensionersintheUKexceededthenumberofminorsforthefirsttimeinhistory.
随机试题
A.双极细胞B.色素上皮细胞C.杆细胞D.锥细胞E.神经节细胞感弱光与无色视觉的是
四季豆中毒的有毒物质是木薯中毒的有毒物质是
下列非处方中成药中适用于风寒感冒的是
患者男,35岁。因“头部外伤”急诊入院。浅昏迷。CT提示颅内血肿,脑挫裂伤。在全麻下行颅内血肿清除术。术后第2日,患者应采取的体位是()
[2010年第62题]关于甲、乙、丙类液体储罐区室外消火栓的布置规定,以下哪项是正确的?
某甲向银行取款时,银行工作人员因点钞失误多付给1万元。甲以这1万元作本钱经商,获利5000元,其中2000元为其劳务管理费用成本。一个月后银行发现了多付款的事实,要求甲退回,甲不同意。下列有关该案的哪一表述是正确的?
海关可以行使“径行开验”的权利,即必须在有见证人到场的情况下开拆货物,进行查验。()
学前儿童在歌唱活动中最难掌握的技能是音准。()
目前中国高考制度是由中国的现实大环境决定的,因为目前中国社会的诚信度不高,公办大学受监督的程度不够,所以一旦放开高考制度,降低分数在录取中的重要性,就很难避免______、弄虚作假、走后门的情况。填入划横线部分最恰当的一项是()。
在窗体上画一个名称为Command1的命令按钮,然后编写如下事件过程:PrivateSubCommand1_Click()X=0n=InputBox("")
最新回复
(
0
)