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
2015-11-27
42
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.
【C9】
选项
A、installed
B、lost
C、found
D、maintained
答案
D
解析
前文提到月尘锋利如玻璃,破坏太空衣、月球靴等,说明它的破坏力很强,那些装有石头的盒子(rock box)也应遭到了破坏。句中主语not one rock box本身已含有否定,因此空格处所填单词应具有肯定意义。D项maintained“保持”符合。
转载请注明原文地址:https://kaotiyun.com/show/B4zZ777K
0
考研英语一
相关试题推荐
Ifyoulockabunchofhigh-IQpeopleinaroomandtellthemtogetonwithatask,whatwilltheye-mergewith?LowerIQs,for
Evenifwecouldmakeitimpossibleforpeopletocommitcrimes,shouldwe?Orwoulddoingsoimproperlydeprivepeopleoftheir
Evenifwecouldmakeitimpossibleforpeopletocommitcrimes,shouldwe?Orwoulddoingsoimproperlydeprivepeopleoftheir
Insurancecompaniesprovideaservicetothecommunitybyprotectingitagainstexpectedandunexpecteddisasters.Beforeanins
Insurancecompaniesprovideaservicetothecommunitybyprotectingitagainstexpectedandunexpecteddisasters.Beforeanins
Insurancecompaniesprovideaservicetothecommunitybyprotectingitagainstexpectedandunexpecteddisasters.Beforeanins
Marriage,anditsmanyupsanddowns,stilloften【C1】______theheadlinesonnewspapers,magazinesandtheairwaves.Nearly23mA
Marriage,anditsmanyupsanddowns,stilloften【C1】______theheadlinesonnewspapers,magazinesandtheairwaves.Nearly23mA
Marriage,anditsmanyupsanddowns,stilloften【C1】______theheadlinesonnewspapers,magazinesandtheairwaves.Nearly23mA
随机试题
根据隧道二次衬砌纵向分段施工要求,分段长度一般为()m。
下列房地产转让中,可以不办理土地使用权出让手续的有()。
B注册会计师是V公司2005年度会计报表审计的项目经理,在审计过程中,需对助理人员编制的有关投资的审计工作底稿进行复核。请你代为做出正确的专业判断。
老年大学的出现体现了当代高等教育的发展趋势是()。
简述学生学习的特殊性。
给定资料1.“2010年‘六-五’世界环境日纪念大会——青年环境友好使者推动全民低碳减排暨《节能减排保护环境》特种邮票首发仪式”6月5日在京召开。环境保护部部长周生贤在致辞中强调,青年一代要积极行动起来,做中国环保新道路的探索者和实践者,加强环境
许多创业成功的人士都没有漂亮的学历,但这并没有妨碍他们成功。事实告诉我们,漂亮的学历对于成功具有重要作用。但是,一个人,只要有准确的信息分析能力、高度的经济敏感和果断的个人勇气,就能很快学会如何做出正确的决定,对于一个缺少以上三种素养的人,漂亮的学历没有什
大同小异:去伪存真
Lookatthechartbelow.Itshowsarestaurant’sincome,totalexpenditureandadvertisingcostsduringaneight-monthperiod.
Itismy(believe)______thatjoggingisgoodforthebodyandforthemind.
最新回复
(
0
)