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
考研
Traveling to Mars is usually a【C1】________business—with a single spacecraft taking off from a single launchpad for the seven-mon
Traveling to Mars is usually a【C1】________business—with a single spacecraft taking off from a single launchpad for the seven-mon
admin
2021-10-14
64
问题
Traveling to Mars is usually a【C1】________business—with a single spacecraft taking off from a single launchpad for the seven-month trip to the Red Planet. That appeared to be the case again on July 30, when NASA’s Perseverance rover roared【C2】________the pad at Cape Canaveral. But this time the ship will have plenty of【C3】________
On July 19, the United Arab Emirates made its first bid to join the Mars game, launching the "Hope" spacecraft on a mission to orbit Mars for at least two years【C4】________studying its atmosphere. Four days later, China launched its "Questions to Heaven" spacecraft, a three-part ship【C5】________an orbiter, a lander and a six-wheel rover. And a fourth mission, a joint Russian-European project, ExoMars, 【C6】________a rover of its own, was also planned for this summer, though it has been【C7】________to 2022 because of engineering problems with its parachute and avionics.
So why all the interest in Mars—and why right now? The timing issue has【C8】________to do with planetary mechanics. As they fly their differing solar orbits—Earth on the inner track, Mars on the outer—the distance between the two worlds is forever changing. At their greatest remove, when they are on【C9】________sides of the sun, they are up to 250 million miles apart. But once every two years, they line up on the same side of the sun, with just 35 million miles separating them. This summer just such an alignment is taking place, dramatically slashing inter planetary travel time to the current seven-month itinerary. So that explains the【C10】________question.
The why part is because of Mars’ tantalizing,【C11】________biological history. The surface of the planet is etched with dry riverbeds, stamped with ancient sea basins, marked by deep depressions that could only【C12】________long-vanished water.
Perseverance is landing in one such place: the Jezero Crater, north of the Martian equator, which is lined with both inflow and outflow channels showing it was once a vibrant sea. Previous rover analyses in similar locations have discovered chemicals and【C13】________that form only in the【C14】________of water, proving that Mars was once, like Earth,【C15】________wet.
Now the mission is to look for actual fossilized organisms or even【C16】________of extant microbial life. To that end, Perseverance is the most ambitious of the new spacecraft and is actually just the first part of a multipart mission. During its explorations, it will【C17】________Martian soil samples and set them neatly on the ground【C18】________another spacecraft that could leave Earth as early as the 2026.
Finding life on Mars would be an epochal【C19】________. The bragging rights that go with being first to make the find is part of what makes the planet the hot new【C20】________
【C14】
选项
A、presence
B、absence
C、present
D、attendance
答案
A
解析
介词短语辨析题。四个选项分别为[A]presence“出席,存在”;[B]absence“缺席,不存在”;[C]present“现在,礼物”;[D]attendance“出席,到场”。空格所在句意为“只有在________水的情况下才会形成的化学物质和化合物”。由常识可判断,在有水的情况下物质易发生化学反应,选项[B]和[D]均与句意不符,故排除,选项[C]在作名词时,无此搭配,故排除。故答案为选项[A]。
转载请注明原文地址:https://kaotiyun.com/show/dRY4777K
0
考研英语二
相关试题推荐
ThemajordifferencebetweennarrativesalesandsuggestivesalesisthatMindycomparessalespeopletowinestewardsinthat_
Excitement,fatigue,andanxietycanallbedetectedfromsomeone’sblinks,accordingtopsychologistJohnStern(21)Washington
Theauthorbelievesinthepassagethat______.AllofthefollowingarestepsinvolvedintruecloningEXCEPT______.
WholesalepricesinJulyrosemoresharplythanexpectedandatafasterratethanconsumerprices,【1】thatbusinesseswerestill
Mosthumanbeingsactuallydecidebeforetheythink.Whenanyhumanbeing—executive,specializedexpert,orpersoninthestreet
Supposeyouhavefoundsomethingwrongwiththeelectronicdictionarythatyoubough!fromanonlinestoretheotherday.Write
Toillustratetheobstaclesthatparentsunconsciouslyplaceintheirchildren’seducationalpath,I’lltellyoualittlestory:
Theroleofgovernmentsinenvironmentalmanagementisdifficultbutinescapable.Sometimes,thestatetriestomanagetheresou
Shouldaleaderstrivetobelovedorfeared?Thisquestion,famouslyposedbyMachiavelli,liesattheheartofJosephNye’sne
Duringtheday,Leipzig’sairportisquiet.Itisatnightthattheairfieldcomestolife.Nexttotherunwayayellowwarehous
随机试题
如果企业的净收益营运指数小于1,说明企业的非经营收益是负值。()
情绪是一种反映形式,其中介为()
菊花具有的功效是
颞下颌关节复发性脱位的治疗方法不包括
患儿,2岁。百日咳后持续发热半月余,体温在38℃左右,易倦纳差,消瘦,近1周头痛,烦躁,时有呕吐,体检:心肺听诊无异常,肝肋下0cm,颈强(±),脑脊液:外观清,蛋白(+),细胞数:80×106/L,糖:5mmol/L,氯化物115mmol/L,诊断为
小凡年满10周岁,精神健康,智力正常。他在学校门口的文具店看中一块橡皮,定价2元,于是用自己的零钱将其买下。下列关于小凡购买橡皮行为效力的表述中,正确的是()。
关于新民主主义革命的任务、目的及对象说法正确的是()。
高速公路上行驶的汽车A的速度是100公里每小时,汽车B的速度是。120公里每小时,此刻汽车A在汽车B前方80公里处,汽车A中途加油停车10分钟后继续向前行驶。那么从两车相距80公里处开始,汽车B至少要多长时间可以追上汽车A?()
数据库概念设计阶段得到的结果是()
A、Olderpeople’saversiontonewmusic.B、Olderpeople’schangingmusicaltastes.C、Insightsintothefeaturesofgoodmusic.D、
最新回复
(
0
)