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
31
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】______
【B1】
选项
答案
telescopes
解析
并列关系题。空格后有lately with satellites,而and前后连接的单词或短语的结构应该是一致的,由此可知,空格处的单词应该和satellites词性相同,都表示观察火星的某种工具。结合录音可知,答案为telescopes。
转载请注明原文地址:https://kaotiyun.com/show/pjB7777K
0
大学英语六级
相关试题推荐
Everyonceinawhilethereasonsfordiscouragementaboutthehumanprospectpileupsohighthatitbecomesdifficulttoseet
A、Theyranahighfever.B、Theydiedfromexcessivebleeding.C、Theirnervoussystemsweredamaged.D、Theysufferedfromhearta
Researchnowsuggestscompaniesthattrytomakeemployeeshappycouldbenefitfromimprovedlevelsofproductivity.WhereSloug
Twentyyearsagothisweek,theBritishinventorTimBerners-Leecreatedtheworldsfirstwebpage.Itisworth【B1】______theex
Twentyyearsagothisweek,theBritishinventorTimBerners-Leecreatedtheworldsfirstwebpage.Itisworth【B1】______theex
FollowingNature’sSignpostsFormany,"navigation"hascometomeantheuseofnavigationalinstrumentsandmaps.However,
A、Workingtoolong.B、Accumulatedstress.C、Badsleepinghabits.D、Anti-sociallifestyles.AWhatdoesthehostattributesleepd
A、Hedoesn’twritewellenough.B、Heisnotaprofessionalwriter.C、Hehasn’tgotanyprofessionalexperience.D、Hedidn’tperf
A、Identifyingandcollectingfood.B、Protectingthemselves.C、Eatingfood.D、Fightingagainsttheenemies.A事实细节题有些鱼类由于视力弱,它们就依
Cigarettesaregoodforyourthroat,accordingtoadvertisementsfromhalfacenturyago.Todaysuchclaimsareunthinkable,as
随机试题
A、蛋白质激素B、肽类激素C、胺类激素D、类固醇激素E、固醇类激素肾上腺素
下列的哪一种心脏病以收缩功能不全心衰为主要特征
皮肤紫癜的特征是
水资源规划按层次划分为()。
为了加强房地产抵押管理,维护房地产市场秩序,保障房地产抵押当事人的合法权益,根据有关法律规定,设定房地产抵押权必须符合的规定有()。
有的人长期监督公车私用,有的人协调解决广场舞噪音扰民问题……一个个普通市民用朴素直接的方式,自下而上参与社会公共事务,这些做法()。
某日晚11时,李某结束为期一周的出差回家,走到家门口时发现家门大开。面对这种情况,李某的下列做法错误的是()。
卡车司机刘某倒车时不慎将路边高压电线杆撞倒后,因害怕承担责任驾车逃逸。后来,放学回家的12岁小学生宋某路过此处,触电死亡。对宋某的死亡,刘某主观方面属于()。
冯特对心理学的最深远贡献是()。
Shootingmoltenrockmorethan500metersintotheair,Etnasentstreamsoflavarushingdownitsnortheasternandsouthernfla
最新回复
(
0
)