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 fan-like toy that spun upward
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese children played with a fan-like toy that spun upward
admin
2015-06-07
70
问题
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 con ceive the first mechanical【B1】______,called a "Helix," which could carry man straight up, but was only a design and was never tested.
The ancient-dream was finally realized in 1940 when a Russian engineer piloted a strange look ing craft of steel tubing with a rotating fan【B2】______.It rose awkwardly and verti cally into the air from a standing start,hovered a few feet above the ground,went【B3】______and backwards, and then settled back to earth. The vehicle was called a helicopter.
Imaginations were fired. Men dreamed of going to work in their own personal helicopters. Peo ple anticipated that vertical flight transports would carry millions of passengers as do the airliners of today. Such fantastic expectations were not【B4】______.
The helicopter has now become an extremely useful machine. It【B5】______in military missions, carrying troops, guns and【B6】______ instruments where other air craft cannot go. Corporations use them as airborne offices, many metropolitan areas use them in po lice work, construction and logging companies employ them in various【B7】______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【B8】______crews and supplies. Any urgent mission toa hard-to-get-to placeisa likely task for a helicopter.Among their other【B9】______of use:deliver people across town,fly to and from airports,【B10】______ rescue work, and aid in the search for missing or wanted persons.
【B9】
选项
答案
multitude
解析
空格前的their other提示此处应填入名词。multitude意为“大量”。这里表示直升机的其他很多用途。
转载请注明原文地址:https://kaotiyun.com/show/aFQ7777K
0
大学英语六级
相关试题推荐
InancienttimestheChinesefarmedforaliving,andalwayslivedontheland【B1】______theirancestorsandnevermovedwithout
InancienttimestheChinesefarmedforaliving,andalwayslivedontheland【B1】______theirancestorsandnevermovedwithout
InancienttimestheChinesefarmedforaliving,andalwayslivedontheland【B1】______theirancestorsandnevermovedwithout
A、Justholdoutone’shands.B、Putone’sthumbupwards.C、Haveasignwithbiglettersonit.D、Bringfewerluggagesandbealon
A、Childrenwillgetabsent-mindediftheyplayvideogames.B、Childrenwillgethealthieriftheychangetheirdiet.C、Children
Childrencanspendhoursadaylookingatcomputerscreensandotherdigitaldevices.Someeyecareprofessionalssayallthats
Childrencanspendhoursadaylookingatcomputerscreensandotherdigitaldevices.Someeyecareprofessionalssayallthats
随机试题
何谓渗碳体?
国际市场人员推销的组织和管理具体包括()
哪一种肿瘤的脑转移CT平扫常为高密度
CO中毒频繁抽搐者,首选的药物是
A.劳力过度B.劳神过度C.房劳过度D.过饥E.过饱
( )是指根据当事人的遗嘱条款设立的遗产信托,它是在当事人去世后遗嘱生效时,再将信托财产转移给托管人,由托管人依据信托的内容,管理处分信托财产。
十七大报告指出:我们必须适应国内外形势的新变化,顺应各族人民过上更好牛活的新期待,把握经济社会发展趋势和规律,坚持中国特色社会主义经济建设、政治建设、文化建设、社会建设的基本目标和基本政策构成的基本纲领,在十六大确立的全面建设小康社会目标的基础上对我国发展
在某市一条不足400米长的步行街上,清洁工人清理出人们吐掉的口香糖约15公斤。某市公交公司无人售票公共汽车3年间收到的残币假钞竟高达50万元。一孕妇在参加公务员录用考试后上了专门接送考生的大客车,全车考生没有一个人给她让座。在对某市市民社会公德现
What’sTom’spurposeofspeakingtoMr.Clinton?
Thedirectortriedtogettheactorsto______tothenextscenebyhandsignals.
最新回复
(
0
)