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
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.
【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://jikaoti.com/ti/XRe7FFFM
0
考研英语一
相关试题推荐
Lookaroundtheworldandtheforcesaremassing.OnonesideareCalifornianprisonguards,Britishpolicemen,Frenchrailworke
Jacoby&Myers,apioneerinfightinginthe1970sforlawyers’righttoadvertise,embodieswhatmanypeopledislikeaboutAmer
Ifyoulockabunchofhigh-IQpeopleinaroomandtellthemtogetonwithatask,whatwilltheye-mergewith?LowerIQs,for
Thefirstmanwho,havingenclosedapieceofground,remindedhimselfofsaying’Thisismine’,andfoundpeoplesimpleenough
AchillingfeatureofthesuicidevideoleftbyMohammadSidiqueKhan,theleaderofthebandthatkilledmorethan50peoplein
Insurancecompaniesprovideaservicetothecommunitybyprotectingitagainstexpectedandunexpecteddisasters.Beforeanins
Marriage,anditsmanyupsanddowns,stilloften【C1】______theheadlinesonnewspapers,magazinesandtheairwaves.Nearly23mA
Marriage,anditsmanyupsanddowns,stilloften【C1】______theheadlinesonnewspapers,magazinesandtheairwaves.Nearly23mA
随机试题
地籍档案是国家档案的重要组成部分,它不仅记录了过去土地管理活动的轨迹,而且为国家建设提供依据,同时也为将来的工作提供参考。()
进度的直观表示方法有()。
监理单位在竞争承揽监理业务时应注意的事项有()。
某企业银行存款日记账余额112000元,银行已收企业未收款项20000元,企业已付银行未付款项4000元,银行已付企业未付款项16000元,调节后的银行存款余额是()元。
下列选项中,认定驰名商标应当考虑的因素有()。
纳税人的下列行为中,属于偷税的有()。
东汉末年,在官渡之战开打前,由于双方实力悬殊,很多人认为曹操必败,曹操下属的很多部将和大臣纷纷暗中给袁绍写信,准备一旦曹操失败以后就归顺袁绍。然而官渡之战中曹操打败了袁绍,并在清理袁绍军营中文书材料时,发现了自己部下写的那些信件。曹操的部下们因此而战战兢兢
刘某因生活琐事与邻居邓某争吵,邓某不堪刘某辱骂,击打刘某面部,致刘鼻骨等部位受伤。刘某向人民法院提起自诉,要求追究邓某的刑事责任。在该案审理过程中,邓某对刘某以侮辱、诽谤罪提起反诉。下列哪些说法是正确的?()
按法律关系各主体间的法律地位是否平等,可将其分为()。
Salesmendependupontheperson-to-personapproachintryingtopersuadeconsumerstobuy.Advertising,however,hastodependu
最新回复
(
0
)