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】______
【B3】
选项
答案
looking
解析
语义推断题。分析句子结构可知,空格处应填入动词现在分词形式与are构成宾语从句的谓语。结合录音可知,答案为looking.
转载请注明原文地址:https://kaotiyun.com/show/4jB7777K
0
大学英语六级
相关试题推荐
MostAmericancollegesanduniversitiesusethegradingsystemofA,B,C,DandF.AnAis【B1】______fourpoints,aBthreepoin
IfenvironmentaltrendsinWesternnationscontinueonapositivetrack,somedaychildrenmayask,"Mommy,whatwaspollution?"
A、Hispopularitywithreluctantpupils.B、Hisinterestinteachingtheory.C、Hisdeterminationtoinvolveallpupils.D、Hisenth
A、It’sexpensivetoextractoil.B、Theoildepositsreducesharplybecauseofoverextracting.C、Theoilindustrybringsaloto
Muchtimeandefforthasbeendedicatedtoresearchingthementalhealthbenefitsofflexibleworkenvironments.Butcantheabi
Researchnowsuggestscompaniesthattrytomakeemployeeshappycouldbenefitfromimprovedlevelsofproductivity.WhereSloug
Twentyyearsagothisweek,theBritishinventorTimBerners-Leecreatedtheworldsfirstwebpage.Itisworth【B1】______theex
A、Findanotherequipment.B、Connecthiscomputertotheoffice.C、Findthemanger’soffice.D、Dopreparationfortheminutes.B女
A、Shesawthemprotesting.B、Shereadabouttheminthenewspaper.C、Sheattendedoneoftheirmeetings.D、Herroommateisamem
______(这些水的痕迹使很多科学家相信)thattheremightbesomeformsoflifeonthatplanet.
随机试题
A.层厚1mm,间距11mmB.层厚2~3mm,间距2~3mmC.层厚2mm,间距2mmD.层厚5mm,间距5mmE.层厚10mm,间距10mm双手及腕关节的扫描常规采用
周女士,65岁,肥胖。有高血脂史及高血压24/13.3kPa(180/100mmHg),近日心前区发生疼痛,考虑为心绞痛。疼痛持续时间应是
外邪引起的疮疡,最常见的病因是
男性,25岁,因高位小肠瘘1d入院,入院后经颈内静脉插管滴入肠外营养液,2周后突然出现寒战、高热,无咳嗽、咳痰,腹部无压痛和反跳痛。观察8h如果仍然有高热,应采取的措施是
背景材料:某城市学校一教学楼由5层主楼和3层辅楼组成。某施工单位(乙方)与某建设单位(甲方)签订了该教学楼的施工合同,合同工期为38周。合同约定,工期每提前(或拖后)1天奖励(或罚款)2500元。乙方提交了拟定的施工网络进度计划(网络进度计划图如
惠江市渡口县昌盛贸易有限公司从事电子产品生产与销售。2018年8月,县税务局依法实施税收专项检查,派人对该公司的纳税情况进行检查。检查人员来到公司后,公司负责人唐某借故避而不见,致使税务人员无法对其询问。此外,唐某还授意财务人员,只向税务人员提供产品
对于普通准备金计提基数的确定,()计算出的准备金水平最高,常用的方法是()
在幼儿园工作实践中,一些老师认为上课是传授知识、发展幼儿智力的唯一途径,组织幼儿进餐、睡眠等只是保育工作,这种思想有违()。
哲学家们之所以坚持先要有真善美的知识,然后才有真善美的行为,其中有一个最大的误解,即错误地认为:有了知识,就有了与之相关的行为;有了真善美的知识,就有了真善美的生活。于是,哲学家们自以为有了获取美好生活的捷径。对上面文字的理解不正确的一项是(
【21】【24】
最新回复
(
0
)