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
2013-05-04
53
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】______
【B5】
选项
答案
radiation
解析
修饰关系题。空格前是形容词,空格后是动词,空格处应填入名词与前面的形容词组成名词性短语作主语。结合录音可知,答案为radiation。
转载请注明原文地址:https://kaotiyun.com/show/ijB7777K
0
大学英语六级
相关试题推荐
A、Theywereborntobepale.B、Theywantedtobedifferentfromthepeasants.C、Theydidnotliketravelinginsunnycountries.
A、Wecanalwayshavehealthysnackfood.B、Wecan’ttakeinenoughfat.C、Theycankeepusfullwithlessfood.D、Theycanprovi
Protectingjust42sitesacrossAsia,rangingfromtemperateforeststotropicalgrasslands,couldbekeytothesurvivalofone
A、Findanotherequipment.B、Connecthiscomputertotheoffice.C、Findthemanger’soffice.D、Dopreparationfortheminutes.B女
I’vealwaysbeenanoptimistandIsupposethatisrootedinmybeliefthatthepowerofcreativityandintelligencecanmaketh
Whichofthefollowingisthebesttitleforthepassage?What’stheauthor’sattitude?
Insciencethemeaningoftheword"explain"suffers【C1】______civilization’severystepinsearchofreality.Sciencecannotre
Theeconomystarted2006extremelystronginspiteofrecordoilpricesandrisinginterestrates.Anunusuallymildwinteracro
A、Sheisnotaveryfamousactress.B、Sheisnotverymuchtemptedbybigmoney.C、Shehasnoideaofhowtomakeadvertisements
随机试题
狄更斯的成名作是__________,近似自传体的小说是____________。
(2011年4月)简述出牛公证的办理条件。
A.戴N95口罩、穿专用防护服、戴双层手套B.戴医用口罩、穿隔离服、戴手套C.穿普通工作服、戴手套D.戴N95口罩、穿普通工作服、戴手套E.戴医用口罩、穿专用防护服、戴双层手套对灭活的流感样病例标本在进行抗原检测时,应采用的防护措施是
下列哪一项是慢性病的三级防治策略
骨折近折段外展,外旋屈曲移位下肢短缩,外展,极度外旋位
有权指定交割仓库的是()。
试述情绪的认知理论。
已知东方公司2007年年初所有者权益总额为1500万元,2007年的资本积累率为12%,年初、年末的权益乘数分别是2.5和2,负债的平均利率是10%,全年固定成本总额为900万元,本年利润总额900万元,优先股股利为60万元,普通股现金股利总额为200万
设向量组α1,α3,α3线性无关,问常数a,b,c满足什么条件时,aα1-α2,bα2-α3,cα3-α1线性相关?
Themunicipalplanningcommissionsaidthattheirfinancialoutlookforthenextyearwasoptimistic.Theyexpectincreasedtax_
最新回复
(
0
)