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
2017-02-17
35
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。
转载请注明原文地址:https://kaotiyun.com/show/1kEZ777K
0
考研英语一
相关试题推荐
IfAmericanmedicinewereapatient,hewouldweigh350poundsandbegainingfast.Despitebeingrepeatedlycounseledaboutthe
IfAmericanmedicinewereapatient,hewouldweigh350poundsandbegainingfast.Despitebeingrepeatedlycounseledaboutthe
IfAmericanmedicinewereapatient,hewouldweigh350poundsandbegainingfast.Despitebeingrepeatedlycounseledaboutthe
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
随机试题
A.蛋白质消化产物B.盐酸C.脂肪D.胆盐刺激肝细胞分泌胆汁的是
在城镇,发现甲类传染病病人、病原携带者或疑似病人时应在多少小时内报告给发病地区所属的县(区)卫生防疫机构
根据建设项目的规模、工期和复杂程度的不同,DAB可由()或()组成。
【汉承秦制】
《伊索寓言》中有这样一段文字:有一只狗习惯于吃鸡蛋,久而久之,它认为“一切鸡蛋都是圆的”。有一次,它看见一个圆圆的海螺,以为是鸡蛋,于是张开大嘴,一口就把海螺吞下肚去,结果肚子痛得直打滚。狗误吃海螺是依据下述哪项判断?
在T-SQL中,提取游标cur1第5行数据的语句是_______ABSOLUTE5FROMcur1…
电子商务所涉及的法律问题相当广泛,概括地说,主要应包括电子合同的有效性、【 】、个人隐私保护和安全法律保证。
当一个Applet被下载到本地环境时,不发生的操作是
给定程序MODI1.C中函数fun的功能是:从3个红球,5个白球,6个黑球中任意取出8个作为一组,进行输出。在每组中,可以没有黑球,但必须要有红球和白球。组合数作为函数值返回。正确的组合数应该是15。程序中i的值代表红球数,J的值代表白球数,k的
Rainforestsarecalledthelungsoftheplanet,becausetheyabsorbcarbondioxide,greenhousegas,andproduceoxygen,whichis
最新回复
(
0
)