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
When Neil Armstrong and Buzz Aldrin returned from the moon, their cargo included nearly fifty pounds of rock and soil, which wer
When Neil Armstrong and Buzz Aldrin returned from the moon, their cargo included nearly fifty pounds of rock and soil, which wer
admin
2023-01-24
22
问题
When Neil Armstrong and Buzz Aldrin returned from the moon, their cargo included nearly fifty pounds of rock and soil, which were packed in an aluminum box with seals designed to maintain the lunar surface’s low-pressure environment. But back at Johnson Space Center, in Houston, scientists discovered that the seals had been【C1】________—by moon dust.
Lunar dust is fine, like a powder,【C2】________it cuts like glass. It’s formed when shooting stars【C3】________on the moon’s surface, heating its rocks and dirt and reducing them to fine particles. Since there’s no wind or water to smooth【C4】________edges, the tiny grains are sharp and uneven, and【C5】________nearly everything.
"The intruding【C6】________of lunar dust represents a more challenging engineering design issue, as well as a【C7】________issue for settlers, than does radiation," wrote Harrison Schmitt, an Apollo 17 astronaut, in his 2006 book, "Return to the Moon." The dust damaged space-suits and ate away layers of moon boots. Over the【C8】________ of six Apollo missions, not one rock box【C9】________its vacuum seal. Dust followed the astronauts back into their ships, too. According to Schmitt, it smelled like gunpowder and made breathing【C10】________. No one knows precisely what the extremely small particles do to human lungs.
The dust not only【C11】________the moon’s surface, but floats up to sixty miles【C12】________it—as an outer part of its atmosphere, where particles【C13】________the moon by gravity, but are so thin that they【C14】________collide. In the nineteen-sixties, Surveyor probes filmed a glowing cloud floating just above the lunar surface during sunrise. Later, Apollo 17 astronaut Gene Cernan, while orbiting the moon, recorded a【C15】________phenomenon at the sharp line where lunar day meets night. Cernan【C16】________a series of pictures illustrating the changing【C17】________; streams of particles popped【C18】________the ground and hovered, and the resulting cloud came into sharper focus as the astronauts’ orbiter approached daylight. Since there’s no wind to form and【C19】________the clouds, their origin is something of a mystery. It’s【C20】________that they’re made of dust, but no one fully understands how or why they do their thing.
【C20】
选项
A、presumed
B、doubted
C、proved
D、hoped
答案
A
解析
上句提到这些云的起因是个谜(a mystery),因此本句说的他们由尘土构成也只能是一种推测。A项presumed有“推测”之意,语义符合。B项doubted“怀疑”,表示对这种看法的质疑,但此处还只是推测。C项proved“证明”,这些云由尘土构成的说法只是一个推测,未经证明。D项hoped“希望”,这些云由什么组成,跟人们的主观愿望无关。
转载请注明原文地址:https://kaotiyun.com/show/hJMD777K
0
考研英语二
相关试题推荐
Skepticsofhighereducationoftencomplainthatuniversitiesoffertoomanyboringdegreeswithlittlevalueintheworkplace.【
Skepticsofhighereducationoftencomplainthatuniversitiesoffertoomanyboringdegreeswithlittlevalueintheworkplace.【
Overthecourseofmanyyears,withoutmakinganygreatfussaboutit,theauthoritiesinNewYorkdisabledmostofthecontrol
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Happypeopleworkdifferently.They’remoreproductive,morecreative,andwillingtotakegreaterrisks.Andnewresearchsugge
Happypeopleworkdifferently.They’remoreproductive,morecreative,andwillingtotakegreaterrisks.Andnewresearchsugge
EnrollmentinLosAngelespublicschoolsisexpectedtoplungebynearly30%overthenextdecade,leadingtotoughchoicesahea
EnrollmentinLosAngelespublicschoolsisexpectedtoplungebynearly30%overthenextdecade,leadingtotoughchoicesahea
Peekthroughtheinspectionwindowsofthenearly100three-dimensional(3D)printersquietlymakingthingsatRedEye,acompany
Peekthroughtheinspectionwindowsofthenearly100three-dimensional(3D)printersquietlymakingthingsatRedEye,acompany
随机试题
早期食管癌的病变范围是
A、Na+B、Cl-、Hco3-和蛋白质C、K+、MgD、HPO42-和蛋白质E、H+细胞内液中主要阴离子是_____。
在恢复一名无反应患者的呼吸之前,你必须检查他有无呼吸。你可以通过听或感受有无气流通过此人的鼻或嘴,还可以采用的方式为
脑出血和蛛网膜下腔出血最主要的区别点是
蝶阀安装焊接前应()阀板,并应采取保护措施。
在中国境内承包工程作业和提供应税劳务的非居民也是营业税的纳税人。()
心理学家______认为,学习是个体利用本身的智慧与理解力对情境及情境与自身关系的顿悟。
当你此刻手捧(1)这份杂志阅读时,双手需要伸直,并且暗暗(2)杂志的(3)委实太小;或者,当你到球场和赛马场,总是(4)不清球场上的球员和赛马场上的(5)。那么,你就要(6)你的身体状况正在(7)下坡。(2)
AretheBritishpeopleEuropeans?ThismayseemastrangequestiontoAfricansandAsians,whotendtothinkofallwhitemenas
Mydaughterhasbeencrazyaboutraisingapet(宠物)foralongtime.LastspringIboughttwonewly-hatchedchickensforher.
最新回复
(
0
)