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
【T1】When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can to keep yo
【T1】When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can to keep yo
admin
2020-03-30
77
问题
【T1】
When you are in the business of sending spacecraft to other planets, it is probably wise to do everything you can to keep your space-probes sterile(无菌的).
NASA, America’s space agency, certainly does so. After all, you would not want bugs from one planet to contaminate another where they might possibly thrive.
But according to Curt Mileikowsky, of the Royal Institute of Technology in Stockholm, this may already have happened naturally billions of years ago when the solar system was young. For Dr. Mileikowsky has taken a century-old idea called panspermia(有生源说), and shown that it is plausible.
【T2】
Panspermia is the theory that life does not start independently on each planet that has it(assuming that other planets do). Rather, it hops from place to place, "infecting" new worlds as it goes.
Supported by experts in biology, geology and celestial mechanics, Dr. Mileikowsky argued to the American Astronomical Society meeting in Atlanta that this is not as outlandish as it sounds.
【T3】
Bungling(笨手笨脚的)space organizations apart, the only mode of travel open to microbes seems to be meteorites(流星). Most of these are small bits of junk from the asteroid(小行星)belt that have gone off course.
But some are rocks that have been flung into space from the surfaces of planets as a result of those planets having been struck by even larger bits of rock—decent-sized asteroids or comets.
【T4】
If there is life on such a planet, microscopic forms of it will probably live deep inside rocks, as they do on earth. The acceleration of lift-off would not kill something that size.
【T5】
If a rock is large enough, the heat generated as it is thrown clear will be negligible except at its surface—where, if anything, melting may even produce an airtight skin to protect any microbes deeper down from the unpleasant vacuum of space.
【T3】
选项
答案
除了凌乱的太空组织以外,流星似乎是微生物进行太空旅行的唯一方式。这些流星大多是来自小行星带并已脱离轨道的小块弃物。
解析
转载请注明原文地址:https://kaotiyun.com/show/dQTO777K
0
考博英语
相关试题推荐
Pleasedonotbe______byhisoffensiveremarkssinceheismerelytryingtoattractattention.
Forlaymenethnologyisprobablythemostinterestingofthebiologicalsciencesfortheveryreasonthatitconcernsanimalsin
Noonewouldhavetimetoreadorlistentoanaccountofeverything______goingonintheworld.
AmericanfootballandbaseballarebecomingknowntotheBritishpublicthroughtelevised______fromtheUnitedStates.
Thetimberrattlesnakeisnowontheendangeredspecieslist,andisextinctintwoeasternstatesinwhichitonce______.
TheamendmentsAofthelawsonpatent,trademarkandcopyrightBhaveenhancedprotectionofCintellectualpropertyrightsandDm
TheprincipaldutyoftheUnitedNationsistosafeguardthepeaceoftheworld.
TheFreedomofInformationActgivesprivatecitizen______governmentfiles.
Itissuggestedthatallgovernmentministersshould______informationtotheirfinancialinterests.
Inhiswillhelefta(n)______ofoveronemilliondollarstobedividedamonghischildren.
随机试题
货币市场是融资期限在()的金融市场。
甲公司部分非财务业绩计量指标包括员工周转率、旷工时间、每个员工的培训时间等,基于非财务信息的业绩计量方法,这最有可能是对下列哪个领域的评价()。
具有同时考虑病人生存期和生命质量优点的最常用的效果指标为质量校正生命年为
女性,38岁,糖尿病12年,每日皮下注射入混合胰岛素治疗,早餐前30U,晚餐前24U,每日进餐规律,主食量300g。近来空腹血糖12.5mmol/L,餐后血糖。7.6~9.0mmol/L。最可能的情况是
下列说法中哪一项是错误的?
下列关于预应力混凝土桥梁施工的规定正确的是( )。
下列关于柔性网边坡防护的叙述中哪个选项是错误的?
对于普通股分析,在美国市场上,经常使用的指数包括()①道琼斯工业平均值;②标准普尔500股票综合指数;③日经指数;④恒生指数
泸沽湖、邛海、马湖和叠溪海子四个湖泊中,面积最大的是()。
A、Thestationerystorehascloseddown.B、Thestationerystoreisclosed.C、Theshopassistantshaveallleftatthatmoment.D、
最新回复
(
0
)