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
33
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】______
【B2】
选项
答案
searched
解析
语义推断题。分析句子结构可知,该句缺少谓语,故空格处应填入谓语动词。而空格前是have,句子使用现在完成时,空格处的动词要使用过去分词。由上句可知,人们使用望远镜、卫星、着陆器和漫游车进行探测,此句也讲探索方式,因此空格处单词应该具有“探索,探测”之意。结合录音可知,答案为searched。
转载请注明原文地址:https://kaotiyun.com/show/ZjB7777K
0
大学英语六级
相关试题推荐
A、Improvetheirteachingeffect.B、Modernizetheirteachingequipments.C、Teachstudentsdifferentlanguages.D、Keepcontactwit
Whenmostpeoplethinkoftheword"education,"theythinkofapupilasasortofanimate(有生命的)sausagecontainer.Intothis
Peoplewithdisabilitiescomprisealargepartofthepopulation.Itis【C1】______thatover35millionAmericanshavephysical,【C
Muchtimeandefforthasbeendedicatedtoresearchingthementalhealthbenefitsofflexibleworkenvironments.Butcantheabi
Iaskedsuccessfulpeoplewhatthesecretoftheirsuccesswas.I【B1】______anearlydiscussionwithavicepresidentofalarge
Twentyyearsagothisweek,theBritishinventorTimBerners-Leecreatedtheworldsfirstwebpage.Itisworth【B1】______theex
FollowingNature’sSignpostsFormany,"navigation"hascometomeantheuseofnavigationalinstrumentsandmaps.However,
A、InsomeEuropeancountries.B、InsomeAfricancountries.C、InsomeAsiancountries.D、InsomeAmericancounties.CInwhichcou
Picasso’sartwasnotjustapleasantdistraction.Theartistbelievedthatarthelpstopenetratefurtherintotheworldandin
OnereasonwhyReebok’smanagerialpersonneldon’tliketheirshoestobecalled"footwearforyuppies’isthat______.Althoug
随机试题
目前国际及国内都以法律形式规定对计算机病毒的()者进行法律制裁。
利用细胞诱导分化治疗恶性肿瘤较成功的是
旋转力除可用于上前牙拔除外,还可用于拔除
肝硬化门脉高压患者,出现全血细胞减少最主要的原因是()
随着国际经济文化一体化的进展,中国与世界各国的药品贸易日渐增多。在中国药品标准的国际化进程中,了解国外的药典十分重要。目前,国际上有代表性的药典有《美国药典》《英国药典》《欧洲药典》和《日本药典》。《中国药典》规定阴凉处系指贮藏处温度不超过()。
关于编制指数时的同度量因素和指数化因素选择,下列表述中正确的是()。
抽样调查10个家庭的住房面积的方差数值为624,则这10个家庭的住房面积的标准差数值是()。
根据《保险法》的规定,下载关于保险合同成立时间的表述中,正确的是()
制订狭义法律的机关可以是全国人民代表大会,还可以是()。
“资本害怕没有利润或者利润太少,就像自然界害怕没有空气一样。一旦有适当的利润,资本就胆大起来,如果有10%的利润,它就保证到处被使用;有20%的利润,它就活跃起来;有50%的利润,它就铤而走险;为了100%的利润,它就敢于践踏一切人间法律;有300%的利润
最新回复
(
0
)