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
52
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/3On7777K
0
大学英语六级
相关试题推荐
7ThingsYouCan’tSayinCanadaAttackingoursacredcows(thingsorpeoplethatcannotbecriticized)mayturnyouintoon
Halloweenusedtobesomethingquitedifferentfromthecelebrationofsugarygreedthatgoesontoday.Earlierinthiscent
TheJapaneseandU.S.governmentsbothstudiedtheconceptof"wiredcities"usingcableTVtodeliverentertainment,informati
A、Itisthemostdifficultspellingsystemintheworld.B、ItcontainsboththeAmericanandtheBritishspelling.C、Itisthes
Activitiessuchaseatingandshoppingaregenerallyincludedin"play".Workisalsoactivity,soourtimemustbefilledwith
OnDecember25,2000,manypeopleacrossNorthAmericareceivedarareChristmastreatwhenthemoonpassedinfrontofthesun
Theloudestoutcryaboutpovertyseemedtocomeinthewealthiestcountrybyfarintheworld.Accordingtomostcalculations,【C
A、Tointerviewafewjobapplicants.B、Tofillavacancyinthecompany.C、Toadvertiseforajuniorsalesmanager.D、Toapplyf
TheauthortellsthestoryofNormanPaintingtoillustrate______.AccordingtoKevinLygo,theBBCfailstoattractyounger
Theyputontheirheadphones,drapeahoodovertheirheadanddriftoffintotheworldof"digitalhighs."VideospostedonYou
随机试题
新建文件单击菜单中的( )/【新建】命令,或按下( )快捷键。
我国《宪法》规定全国人大常委会拥有广泛的权力,一共有21项职权,可以归纳为5个方面:(1)_________;(2)_________;(3)_________;(4)_________;(5)_________。
1948年中国共产党在“五一口号”中提出的口号是()
肾病综合征的中医证型,不包括的是
某厂的甲产品单位工时定额为80小时,经过两道工序加工完成,第一道工序的定额工时为20小时,第二道工序的定额工时为60小时。假设本月末第一道工序有在产品30件,平均完工程度为60%;第二道工序有在产品50件,平均完工程度为40%。则分配人工费用时在产品的约当
下列关于预防成本的叙述正确的有()。
下列不属于《中华人民共和国消费者权益保护法》中规定的消费者权利的是:
社会政治结构或政治上层建筑的核心是
TheannouncementisMade______.Peopleareasked______.
Shewasdeterminedto______herreputationintheforeignservicebylearningtospeakChinese.
最新回复
(
0
)