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
The main reason we explore Mars is to determine if life ever existed on the planet. We have tried for centuries, starting with 【
The main reason we explore Mars is to determine if life ever existed on the planet. We have tried for centuries, starting with 【
admin
2013-07-20
62
问题
The main reason we explore Mars is to determine if life ever existed on the planet. We have tried for centuries, starting with 【B1】______and lately with satellites, landers and rovers. We have 【B2】______ for it directly and indirectly. No luck so far. Some think life has never been there. Others think it was there in the past but is now gone. Many think why bother, but that’s a whole different story. I think we are 【B3】______in the wrong places. Here is why.
The surface of Mars is 【B4】______cold and dry. Cosmic and solar 【B5】______reach the surface by the thin atmosphere, and the soil contains strong oxidants (氧化剂)that destroy organic 【B6】______. Fat chance for life. But it wasn’t always so.
Early in its history Mars was warmer and 【B7】______enough for the development of rivers, lakes and perhaps oceans. The atmosphere was thicker and the protective magnetic (磁的)field was switched on. Mars might be 【B8】______today, but life would have been possible in the past. 【B9】______
But first we need to find a promising location, and that means reconstructing Martian history. 【B10】______, what type of minerals formed and if the geochemical conditions were compatible with life. Once promising sites are identified, we need to find out if there are 【B11】______
【B8】
选项
答案
uninhabitable
解析
句意推断题。根据句型可知此句是主系表结构,空格处要填入一个形容词作表语。根据下半句,过去的火星或许有生命迹象,由but可知上半句的句意应该与其相反,意为“现在的火星是不适宜居住的”。结合录音可知,答案为uninhabitable。
转载请注明原文地址:https://kaotiyun.com/show/WOn7777K
0
大学英语六级
相关试题推荐
IntheUnitedStates,thefirstdaynurserywasopenedin1854.Nurserieswereestablishedinvariousareasduringthe【C1】______
It’sperhapstheworld’smostfamousunderwaterattraction,immortalizedinfilmandinlegend:theTitanic.Butnowexpertssay
7ThingsYouCan’tSayinCanadaAttackingoursacredcows(thingsorpeoplethatcannotbecriticized)mayturnyouintoon
Parentsareoftenupsetwhentheirchildrenpraisethehomesoftheirfriendsandregarditasaslur(诽谤,中伤)ontheirowncooki
A、Thetelevision.B、Theradio.C、Thepaper.D、Thepoliceman.BWhatwastellingpeopletogoandsleepintheparks?
Howaretornadoesdistinguishedfromwhirlwinds?Theauthorreferstostrawembeddedinfencepostsinordertoshow
A、ThatGhanaiantomatoestastebetterthanBritishones.B、ThatBritishtomatoesarehealthierthanGhanaianones.C、Thatprotec
Thegravitationalpulloftheearthandmoonisimportanttousasweattempttoconquermoreandmoreofouterspace.Here’swh
TheFutureoftheBBCAsaboygrowingupinthe1930sintheMidlands,NormanPainting,thesonofarailway-man,listenedt
A、HemadeanovelCVtoattracttheemployers.B、HepostedalargenumberofCVsonthenet.C、Herecommendedhimselfdoortodo
随机试题
半标准式口头咨询
领导体制作为领导活动中领导权限划分和领导机构设置的制度体系。本质上是一种()的重要方式。
下列几种DNA分子的碱基组成比例各小相同,哪一种DNA的解链温度最低()(1999年)
臭氧用于医院空气消毒的最低浓度和作用时间分别为
《金匮要略》中苓桂术甘汤主治
事故调查报告应当包括的内容有()。
劳动合同的订立要求( )。
某种密码锁的界面是一组汉字键,只有不重复并且不遗漏地依次按下界面上的汉字才能打开,其中只有一种顺序是正确的。要使得每次对密码锁进行破解的成功率在万分之一以下,则密码锁的界面至少要设置__________个汉字键。
UML中的____________图的主要作用是陈述活动与活动之间流程控制的转移,其作用类似于流程图,然而与流程图不同的是其支持并行行为。
WhatIsLiteraryWriting?I.Literaryworkshavecreativeor【T1】______content【T1】______—attractmenandwomen—toyieldaest
最新回复
(
0
)