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
48
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.
【C12】
选项
A、above
B、across
C、on
D、through
答案
A
解析
本句提到月尘floats up to sixty mile(漂浮到6英里外),说明它在月球表面之上的空中。A项above“在……之上(上方)”符合语义逻辑。
转载请注明原文地址:https://kaotiyun.com/show/TkEZ777K
0
考研英语一
相关试题推荐
Ininterviews,famouspeopleoftensaythatthekeytobecomingbothhappyandsuccessfulisto"dowhatyoulove."Butmasterin
Socialsciencehasweighedinonthe"tigermom"debate,anditlookslikeeveryoneisright:Bothover-protectiveandlaid-back
Socialsciencehasweighedinonthe"tigermom"debate,anditlookslikeeveryoneisright:Bothover-protectiveandlaid-back
Socialsciencehasweighedinonthe"tigermom"debate,anditlookslikeeveryoneisright:Bothover-protectiveandlaid-back
IsStanfordstillauniversity?TheWallStreetJournalrecentlyreportedthatmorethanadozenstudentshaveleftschooltowo
IsStanfordstillauniversity?TheWallStreetJournalrecentlyreportedthatmorethanadozenstudentshaveleftschooltowo
Airpollutionkilledaboutsevenmillionpeoplelastyear,makingittheworld’ssinglebiggestenvironmentalhealthrisk,theW
Airpollutionkilledaboutsevenmillionpeoplelastyear,makingittheworld’ssinglebiggestenvironmentalhealthrisk,theW
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
随机试题
在考生文件夹下有一个“Acc3.mdb”数据库。(1)以“房产销售情况表”为数据源,创建“销售明细”窗体,在窗体中显示“房产销售情况表”的全部字段,文本框的特殊效果为“平面”。在窗体页眉中添加“销售信息明细”标签。标签文本格式为“宋体”、“12号”、“加
1根普通平带宽100mm、胶布层为6层、长15m,问这根平带的平方米数是多少?
患者,女性,38岁。风心病5年。超声心动图检查示二尖瓣中度狭窄。2个月前曾患感冒,当时发热1周。近1个月工作较劳累,经常出现夜间阵发性呼吸困难。目前体温正常,血、尿常规正常。应首选用下列哪种药物治疗
除以上体征外,护士若考虑该妇女怀孕,其另外的可能体征是该孕妇的预产期是
能与氢氧化钠溶液反应呈红色的化合物是
患者,女性,30岁。因外出春游去植物园,出现咳嗽、咳痰伴喘息1天入院。体检:体温36.5℃,脉搏90次/分钟,呼吸28次/分,血压110/80mmHg,喘息貌,口唇发绀,在肺部可闻及广泛哮鸣音。患者进一步表现为发绀明显、端坐呼吸、大汗淋漓,经一般解痉、
某重力式码头基础长200m,分两段施工,基槽开挖要求风化岩层以上的黏土及淤泥层要全部挖除,抛泥区距施工现场6km。该基床施工的主要工序为:基槽开挖、基床抛石、夯实、整平,每道工序只各安排一班作业,各工序工期分别为60d、15d、5d、20d。由于工作面受限
转移收入是指不是作为生产要素提供的劳务的报酬的收入,从而也是不能计入国民收入的收入,是来自非生产、交换过程的收入。根据上述定义,下列不属于转移收入的是:
在Access数据库中使用向导创建查询,其数据可以来自()。
Adolescentsaretakinglongertobecomefullyproductivemembersofsociety,ReedLarson,professorofhumandevelopment,Univer
最新回复
(
0
)