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
31
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://jikaoti.com/ti/xdv7FFFM
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
IsStanfordstillauniversity?TheWallStreetJournalrecentlyreportedthatmorethanadozenstudentshaveleftschooltowo
Airpollutionkilledaboutsevenmillionpeoplelastyear,makingittheworld’ssinglebiggestenvironmentalhealthrisk,theW
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
Nearlythree-quarteroftheEarthiscoveredwithwater.The【B1】______ofthecontinents,especiallyinthetemperatezones,isv
随机试题
在1956年4月召开的中央政治局扩大会议上,毛泽东提出的社会主义文化建设的新方针是
用立位滤线器摄影的体位是
某酒店是由甲市乡镇企业局与乙市某股份公司合作兴建的,其中乙市某股份公司出地,占地面积为1250m2,占大楼40%的股份;甲市乡镇企业局出资480万元,占大楼60%的股份。酒店原设计为内部招待所,基建工程于2000年6月动工,2002年4月正式投入使用。楼高
资产管理业务投资期货类品种的,期货公司应当()。
在基金投资组合管理中,()对基金投资组合的最终表现有着最重要的影响。
客户还款方式一旦确定,就不得变更。()
消费者在购买商品或接受服务时,有权获得的交易公平条件包括()。
在体育单元教学中,将全班同学分成几个异质或同质的学习小组进行学习、比赛与展示,教师这种教学安排采用的是()。
胼胝体是将大脑两个半球联系起来的神经纤维集束。平均而言,音乐家的胼胝体比非音乐家的胼胝体大。与成年的非音乐家相比,7岁左右开始训练的成年音乐家,胼胝体在体积上的区别特别明显。因此,音乐训练,特别是从幼年开始的音乐训练,会导致大脑结构上的某种变化。以下哪一项
在考生文件夹下创建一个下拉式菜单mymenu.mnx,并生成菜单程序mymenu.mpr。运行该菜单程序时会在当前VFP系统菜单的末尾追加一个“考试”子菜单,如图2—11所示。菜单命令“计算”和“返回”的功能都通过执行过程完成。菜单命
最新回复
(
0
)