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
外语
For centuries men dreamed of achieving vertical flight. In 400 A.(D), Chinese children played with a【B1】______toy that spun upwa
For centuries men dreamed of achieving vertical flight. In 400 A.(D), Chinese children played with a【B1】______toy that spun upwa
admin
2015-07-16
28
问题
For centuries men dreamed of achieving vertical flight. In 400 A.(D), Chinese children played with a【B1】______toy that spun upwards and fell back to earth as rotation ceased. Leonardo da Vinci【B2】______the fast mechanical apparatus, called a "Helix", which could carry a man straight up, but this was only a【B3】______and was never tested.
The ancient dream was finally【B4】______in 1940 when a Russian engineer piloted a strange looking craft of steel tubing with a rotating fan on top. It rose【B5】______and vertically into the air from a standing start, hovered a few feet above the ground, went sideways and backwards and then【B6】______back to earth. That【B7】______was called a helicopter.
【B8】______were fired. Men dreamed of going to work in their own personal helicopters. People anticipated that vertical fight【B9】______would carry millions of passengers as do the airliners of today. Such fantastic expectations were not fulfilled.
The helicopter has now become an extremely useful machine It【B10】______in military missions, carrying groops, guns and strategic instruments where other aircraft cannot go. Corporations use them as airborne offices, many metropolitan areas use them in police work, construction and logging companies employ them in various advantageous ways, engineers use them for site selection and surveying, and oil companies use them as the best way to make offshore and remote work stations accessible to crews and supplies. Any urgent mission to a hard-to-get-to place is a likely task for a helicopter. Among their other multitude of uses: deliver people across town, fly to and from airports, assist in rescue work,and aid in the search for missing or wanted persons.
【B6】
For centuries men dreamed of achieving vertical flight. In 400 A. D. , Chinese children played with a fan—like toy that spun upwards and fell back to earth as rotation ceased. Leonardo da Vinci conceive the fast mechanical apparatus, called a "Helix", which could carry a man straight up, but this was only a design and was never tested.
The ancient dream was finally realized in 1940 when a Russian engineer piloted a strange looking craft of steel tubing with a rotating fan on top. It rose awkwardly and vertically into the air from a standing start, hovered a few feet above the ground, went sideways and backwards and then settled back to earth. That vehicle was called a helicopter.
Imaginations were fired. Men dreamed of going to work in their own personal helicopters. People anticipated that vertical fight transports would carry millions of passengers as do the airliners of today. Such fantastic expectations were not fulfilled.
The helicopter has now become an extremely useful machine It excels in military missions, carrying troops, guns and strategic instruments where other aircraft cannot go. Corporations use them as airborne offices, many metropolitan areas use them in police work, construction and logging companies employ them in various advantageous ways, engineers use them for site selection and surveying, and oil companies use them as the best way to make offshore and remote work stations accessible to crews and supplies. Any urgent mission to a hard-to-get-to place is a likely task for a helicopter. Among their other multitude of uses: deliver people across town, fly to and from airports, assist in rescue work,and aid in the search for missing or wanted persons.
选项
答案
settled
解析
空格前的并列连词and和空格后的副词back提示所填词应为动词的一般过去式,与rose,hovered和went构成并列关系。根据句中的went...backward推测,此处应表示“返回地面”的含义。settled,动词的一般过去式,意为“降落"。
转载请注明原文地址:https://kaotiyun.com/show/cAQ7777K
0
大学英语六级
相关试题推荐
WhenitcomestoInstagramming(图片分享)yourdinner,Isayliveandletlive,youknow?Maybeyoursaladwasparticularlyaesthetica
A、Ithasworld-famousplayersandsuperstars.B、Ithasmodernfacilitiesandisconvenienttotravel.C、Itisneartheseasidew
A、Hedoesn’tlikeactivitiesincollege.B、Hepartlyagreeswiththewoman.C、Hethinksactivitiesaremoreimportant.D、Heknow
Fedupofyourdesk-bound9-5job?Wishyouspentyourdaysbeingpamperedinstead?Dreamofbeingpaidtotravelacrosstheglo
TheScienceBehindtheNumbersThatGovernOurLivesA)Numbersareeverywhereinyourlife.Youcanassignanumbertojustabou
Mytopicishandedness—whetherindifferentsportsitisbettertobeleftorright-sidedorwhetheramorebalancedapproachis
A、Interested.B、Indifferent.C、Suspicious.D、Negative.D女士建议男士选择坐游船去希腊或者土耳其旅行,男士说味道浓郁的食物不合自己的胃口,言下之意就是不接受这个建议,故选D。
A、Heboughtitatawell-knownstore.B、Itwasveryexpensive.C、Hedoesn’tconsideritattractive.D、Someonegaveittohim.D“
A、Hedoesn’thavetimetodohislaundry.B、He’dlikethewomantobuysomedetergent.C、He’sgoingtothestore.D、He’sgoingt
RainforestCity[A]Apatchoftropicalrainforesthastwicethenumberofmammalspecies,fivetimesthebatsandbirdsandten
随机试题
极外侧型腰5骶1椎间盘突出,最可能压迫的神经根是
既能补气,又能养阴的药物是
维拉帕米不能用于治疗()。
下列关于项目进度计划的表述,错误的是()。
若实数a,b,c满足a:b:c=1:2:5,且口+6+c=24,则a2+b2+c2=().
程序、进程和线程3个概念之间的关系是()。
Thesatisfactionofcustomers’desirefornewproductsis______.Endusersdesireallthetime______.
YouwillhearaninterviewwithJoeNocera.Foreachquestion(23-30),markoneletter(A,BorC)forthecorrectanswer.
Whenwestartedcriticizinghiswork,hesawred.Theunderlinepartmeans________.
Thoughitisamereonetothreepercentofthepopulation,theupperclasspossessesatleast25percentofthenation’swealt
最新回复
(
0
)