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
33
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
Television:theCyclopsthatEatsBooksA)WhatisdestroyingAmericatodayisnottheliberalbreedofpoliticians,ortheInter
A、Becauseweweretaughtsobyourparentsfromourchildhood.B、Becausewearedeceivedbyoursenseofvision.C、Becauseitis
A、Withthehelpofhisfriends.B、Byfollowingthetracksofanimals.C、Byusingacompass.D、Withthehelpoftheguide.B细节题。玄
FilmSchoolsA)Filmschoolsandfilmdirectingschoolsprovideaspiringfilmstudentswithasolidunderstandingofthemanyfac
FilmSchoolsA)Filmschoolsandfilmdirectingschoolsprovideaspiringfilmstudentswithasolidunderstandingofthemanyfac
AnneHechehasprovenherselfanexceptionalactressinfilm,televisionandstage.Hertalentshaveearnedhercriticalpraise
Awisemanoncesaidthattheonlythingnecessaryforthetriumphofevilisforgoodmentodonothing.So,asapoliceoffice
A、ProfessorSmithdoesn’tholdseminarsordiscussionsinhislectures.B、StudentssometimesfallasleepinProfessorSmith’sle
MostvolcanoesarequietTheyrestpeacefullyforhundredsofyears.NoonepaysmuchattentiontothemMountStHelenswasone
IfthepopulationoftheEarthgoesonincreasingatitspresentrate,therewilleventuallynotbeenoughresourcesleftto【B1】
随机试题
五四运动的直接导火线是
符合1型糖尿病特点的选项有
化学结构为的药物是
A、贝壳B、干燥分泌物C、角D、除去内脏的干燥体E、病理产物土蛎的药用部位是()
A、生蒲黄B、鸡尿藤C、西红花D、罂粟壳E、血余炭须按特殊管理药品管理,不能装于一般药斗内的是
甲、乙、丙、丁四家公司出现下列情况,哪家公司应在2个月内召开临时股东大会?()
2007年某月,甲于深夜潜入乙宅,伺机盗窃,乙听到动静后起床并将甲堵在屋内,甲为逃离遂与乙发生打斗,其间,与乙一起居住的乙父丙亦惊醒起床,前来帮助乙擒甲,见乙不敌甲,于是丙就操起身边的菜刀对准甲就是一刀。但甲受伤后仍旧逃脱,后因为伤势严重死亡。对于丙的行为
表征臂架起重机起重特性的指标是起重力矩。起重量与幅度的关系以下选项正确的是()。
水工建筑物要求地基有足够的()。
如果十月一日是星期一。那么十月十五日是星期几?
最新回复
(
0
)