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
57
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】______
【B6】
选项
答案
compounds
解析
语义推断题。空格前是形容词,空格处应填入名词在从句中作宾语。结合录音可知,答案为compounds。此处意为:土壤当中所含的氧化剂能破坏土壤的有机成分。
转载请注明原文地址:https://kaotiyun.com/show/YjB7777K
0
大学英语六级
相关试题推荐
A、Nomeltinghasbeenobserved.B、Thepastseveralwintershavebeenunusuallysevere.C、Nothingunusualhashappenedinotherp
TheInternet,e-commerceandglobalizationaremakinganeweconomicerapossible.Bythemiddleofthe21stcentury,capitalist
Researchnowsuggestscompaniesthattrytomakeemployeeshappycouldbenefitfromimprovedlevelsofproductivity.WhereSloug
FollowingNature’sSignpostsFormany,"navigation"hascometomeantheuseofnavigationalinstrumentsandmaps.However,
A、Hisfirstapplicationwillnotbere-evaluated.B、Hewillhavetore-applythefollowingyear.C、Hisfamily’sfinancialcondit
A、InsomeEuropeancountries.B、InsomeAfricancountries.C、InsomeAsiancountries.D、InsomeAmericancounties.CInwhichcou
I’vealwaysbeenanoptimistandIsupposethatisrootedinmybeliefthatthepowerofcreativityandintelligencecanmaketh
A、Differenttypesofsandwiches.B、ThemostpopularsandwichinUK.C、Theoriginofsandwiches.D、Thereasonsofsandwich’spopu
A、Attheman’shome.B、Attheairlinereservationagency.C、Atthewoman’shouse.D、Attheman’soffice.D选项表明,本题考查地点场所,需要快速浏览各个
随机试题
肝门静脉与上、下腔静脉吻合的部位是
患儿,3岁。腹泻5天,临床诊断中度等渗性脱水。当静脉补液纠正脱水有尿后,宜选用静脉处方补钾最合适的是
男性,60岁。2小时前与人争吵后突发头痛,吐咖啡色液体。查体::BP190/120mmHg,深昏迷,双侧瞳孔小,四肢瘫、颈有阻力。四肢有阵发性强直出现,诊断为高血压性脑出血。出血部位可能为
分离汉防己甲素和汉防己乙素,主要是利用二者
下列哪一项属于现货期权?()
显示性测验是指测验题目和所要测量的心理特征相似的测验。古德纳夫曾经将其分为()和()。
程序教学模式是()在教学理论上的运用。
论证有效性分析:分析下面的论证在概念、论证方法、论据及结论等方面的有效性,600字左右。很多将青春安放到大城市的人,并没有做好实力和心理上的准备,在一哄而上的“向大城市进军”中,盲目从众,甚至贸然将二线城市的舒适工作扔掉,去大城市蜗居。而大城市给
设有表示学生选课的三张表,学生S(学号,姓名,性别,年龄,身份证号),课程C(课号,课名),选课SC(学号,课号,成绩),则表SC的关键字(键或码)为
In1951,Timemagazinesetouttopaintaportraitofthenation’syouth,thosebornintotheGreatDepression.Itdoomedthema
最新回复
(
0
)