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
You are going to read a list of headings and a text about the Deep Impact by NASA; Choose the most suitable heading from the lis
You are going to read a list of headings and a text about the Deep Impact by NASA; Choose the most suitable heading from the lis
admin
2010-11-27
34
问题
You are going to read a list of headings and a text about the Deep Impact by NASA; Choose the most suitable heading from the list for each numbered paragraph. The first paragraph and the last two paragraphs of the text are not numbered. There is one extra heading which you don’t need to use.
A. Revelation of the nature of comets
B. A perfect representative of the comets
C. Hoping for the best
D. Right time and right place for the Impact
E. What to expect of this Deep Impact?
F. Mystery in the heavens
On Monday at 1:52 a.m. ET, a probe deployed by a NASA spacecraft 83 million miles from home will smash at 23,000 mph into an ancient comet the size of Manhattan, blasting a hole perhaps 14 stories deep.
(41)______.
Launched in January, NASA’s $333 million Deep Impact mission is designed to answer questions that scientists have long had about comets, the ominous icebergs of space. This is the first time any space agency has staged such a deliberate crash. Scientists hope images transmitted by the probe and its mother ship will tell them about conditions in the early solar system, when comets and planets, including Earth, were formed. The team hopes to release photos of the impact as soon as they are received from the craft. NASA and observatories across the nation will be releasing webcasts.
(42)______.
At the very least, NASA says, knowing how deep the probe dives into the comet could settle the debate over whether comets are compact ice cubes or porous snow cones. "We need to dig as deep a hole as possible", says mission science Chief Michael A’Hearn of the University of Maryland. Until now, the closest scientists have come to a comet was when NASA’s Stardust mission passed within 167 miles of the comet Wild 2 last year, collecting comet dust that is bound for a return to Earth in January. The most famous date with a comet occurred when an international spacecraft flotilla greeted Halley’s comet in 1986. But these quick looks examined only the comets’ dust and Surface;
(43)______.
To the ancients, comets were harbingers of doom, celestial intruders on the perfection of the heavens that presaged disaster. Modern astronomers have looked on them more favorably, at least since Edmond Halley’s celebrated 1705 prediction of the return of Halley’s Comet in 1758 and every 75 years thereafter. Today, scientists believe Tempel 1 (named for Ernst Wilhelm Leberecht Tempel, who first spotted it in 1867 while searching for comets in the sky over Marseilles, France) and other comets are windows to the earliest days of the solar system, 4.6 billion years ago, when planets formed from the dust disk surrounding the infant sun.
(44)______.
Deep Impact’s copper-plated "impactor"—a 39-inch long, 820-pound beer-barrel-shaped probe—will be "run over like a penny on a train track" when it crashes, A’Hearn says. The impactor is equipped with a navigation system to make sure it smacks into the comet in the right location for the flyby craft’s cameras. On Sunday, the flyby spacecraft will release the probe. Twelve minutes later, it will beat a hasty retreat with a maneuver aimed at allowing a close flyby, from 5,348 miles away, with cameras pointed. Fourteen minutes after the impact, the flyby spacecraft will scoot to within a mere 310 miles for a close-up of the damage.
(45)______.
Ideally, everything will line up, and the flyby spacecraft will take images of the crater caused by the impact. It will go into a "shielded" mode as ice and dust batter the craft, then emerge to take more pictures. "The realistic worst case is hitting (the comet) but not having the flyby in the right place", A’Hearn says. "Basically, we have a bullet trying to hit a second bullet with a third bullet in the right place at the right time to watch. I’d love to have a joystick(操纵杆) to control the impactor".
Planetary scientists have "no idea" what sort of crater will result, McFadden says. Predictions range from a deep but skinny shaft driven into a porous snow cone to a football stadium-sized excavation in a hard-packed ice ball.
But astronomers should have their answer shortly after impact, which should settle some questions about the comet’s crust and interior. Analysis of the chemistry of that interior, based on the light spectra given off in the impact’s aftermath, could take much longer.
选项
答案
D
解析
撞击物必须在合适的时间、合适的位置撞击坦普尔彗星,以便飞行器拍摄画面,从而便于科学家的研究探讨,所以本段的合适标题应是D。
转载请注明原文地址:https://kaotiyun.com/show/M3Z4777K
0
考研英语一
相关试题推荐
YouaregoingtoreadatextaboutstudyingintheUnitedStatesfollowedbyalistofexamples.Choosethebestexamplefromth
Fromwhatyouhaveread,wouldyouexpectmannerstoimproveamongpeoplewho_____.Whatisthepossiblemeaningoftheword"
Whatistheessenceofthistext?Accordingtothetext.theauthor’sattitudetowardthevalueofstandardizedtestsseemsto
Whatistheessenceofthistext?Theselectionimpliesthat,moreoften,thevalueofaneducationaltestrestswith_____.
Inthefollowingarticle,somesentenceshavebeenremoved.ForQuestions41—45,choosethemostsuitableonefromthelistA—G
Inthefollowingarticle,somesentenceshavebeenremoved.ChoosethemostsuitableonefromthelistA—Gtofitintoeachoft
Thephrase"whistleblower"(Lastline,Paragraph3)probablymeans______.Bymentioningthe9.11terroristattackinParagrap
AmericanandJapaneseresearchersaredevelopingasmartcarthatwillhelpdriversavoidaccidentsbypredictingwhentheyare
SoBig.Fdamagedcomputerprogramsmainlyby_____.Whichofthefollowingbestdefinestheword"doctored"(Line10,Paragraph
"Worsethanuseless,"fumedDarrellIssa,aRepublicancongressmanfromCalifornia,onMarch19th,whentheHouseJudiciaryComm
随机试题
Inordertolearnaforeignlanguagewell,itisnecessarytoovercomethefearofmakingmistakes.Iftheprimarygoal(目标)of
男性,40岁,发现右颊黏膜白色斑块1个月,临床检查除右颊孤立白色斑块外未发现其他病损。你认为下列哪项提供的信息丕星以作为本病例的发病因素
风险/效益比是
男,42岁,2年前诊断为原发性慢性肾上腺皮质功能减退症。长期口服氢化可的松(30mg/d)替代治疗。近2天发热38℃,咽痛。目前氢化可的松应
A.处方药B.处方药和甲类非处方药C.乙类非处方药D.甲类非处方药E.非处方药根据《处方药与非处方药分类管理办法(试行)》不能在大众媒介上发布广告的药品是
获得()资质的企业,可以承接建设单位按照规定发包的工程。
背景某宿舍楼土建工程,建筑面积为15548m2,全现浇钢筋混凝土结构,地下1层,地上14层。业主要求承包单位按工料单价法中的以直接工程费为计算基础的程序进行计算。计算结果如下:按工程量和工、料、机单价计算,其合价为2274.93万元;各类措施费的合计费率
汪某,女性,60岁,家庭妇女。吸烟40余年,慢支病史20余年,气短5年。体格检查:体温36℃,脉搏96次/分,呼吸20次/分,血压130/85mmHg,桶状胸,双肺叩诊过清音,触觉语颤减弱,肺泡呼吸音减弱。心尖搏动位于左侧第5肋间锁骨中线外1.0cm。实验
“APEC蓝、青奥蓝、春节蓝”,由于雾霾,“蓝”更显可贵。2013年9月,国务院颁布大气污染防治行动计划。一年多来,这个行动计划成为各地各部门防治大气污染的共同行动指南。APEC会议期间,北京、天津、河北、山西、内蒙古、山东、河南等省区
给定资料1.2013年,听到家里的“顶梁柱”遭遇车祸去世的噩耗时,41岁的徐某抱着女儿痛哭不已。尽管法院判决肇事司机赔偿徐某一家22万余元,但被执行人却无可供执行的财产。女儿在念高中,公婆则卧病在床,无论是学杂费还是医药费,对于这个贫困的农村家庭
最新回复
(
0
)