首页
登录
职称英语
The main reason we explore Mars is to determine if life ever existed on the
The main reason we explore Mars is to determine if life ever existed on the
游客
2023-09-01
40
管理
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】______ [br] 【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://tihaiku.com/zcyy/2975604.html
相关试题推荐
[originaltext]AfteryearsofstudyIhavedeterminedthatthereareonlytw
[originaltext]AfteryearsofstudyIhavedeterminedthatthereareonlytw
[originaltext]Facialexpressionscarrymeaningthatisdeterminedbysituat
[originaltext]It’sgreatfuntoexplorenewplaces—itfeelslikeanadven
He______(不应该让我们等了那么长时间)fornoreasonatall,whichisquiteimpolite.shouldn’
Thedictionaryisoftenusedtodeterminethecorrectspellingofwords,or
Thedictionaryisoftenusedtodeterminethecorrectspellingofwords,or
Thedictionaryisoftenusedtodeterminethecorrectspellingofwords,or
Thedictionaryisoftenusedtodeterminethecorrectspellingofwords,or
Thedictionaryisoftenusedtodeterminethecorrectspellingofwords,or
随机试题
Toincreasevisibilityofnewproducts,thestore’sdisplaydesignersmadeitth
GymCrazeI.ThegymcrazebecomesChinese【T1】______.【T1】______A.asignof
启动电流较大的消防设备宜分时启动()。
钢丝绳在破断前一般有()等预兆,容易检查、便于预防事故。A.表面光亮 B.生
我国健康管理的主要任务是()A.提供全人、全程、全方位健康管理服务 B.提
宫内节育器的避孕原理不包括A、影响受精卵发育 B、宫腔内自然环境改变 C
私募基金管理人应当向投资者进一步声明,中国基金业协会为私募基金管理人和私募基金办
乳头浆液性无色溢液可见于( )。A.导管内乳头状瘤 B.乳管阻塞的导管内乳头
与心理咨询师A的第二次咨询: 心理咨询师A:感觉你情绪很不好,发生了什么事情?
社会惰化的主要原因包括()。A:模仿B:竞争意识增加C:被评价的焦虑减弱D
最新回复
(
0
)