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
13
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.
【B5】
选项
答案
excels
解析
空格所在句子缺少谓语,根据主语it和前后文的语态,推断此处应填入动词第三人称单数形式。excels意为“擅长”。
转载请注明原文地址:https://jikaoti.com/ti/sm6FFFFM
0
大学英语六级
相关试题推荐
AfterSusanJoycewaslaidoff,shewashorrifiedtohearoftwosuicidesinherlayoffgroup.Suchcasesmaysound【C1】______,b
A、Artisseparatefromtechnicalskills.B、Artshouldbeenjoyedbyeverybody.C、Artisaformofluxuryobject.D、Artshouldbe
InancienttimestheChinesefarmedforaliving,andalwayslivedontheland【B1】______theirancestorsandnevermovedwithout
Itisafamiliarscenethesedays:employeestakingnewlylaid-offco-workersoutforaconsolationdrink.Butwhichsidedeserv
Childrencanspendhoursadaylookingatcomputerscreensandotherdigitaldevices.Someeyecareprofessionalssayallthats
A、Agoodsecondaryeducation.B、Apleasantneighbourhood.C、Ahappychildhood.D、Ayearofpracticaltraining.A对话一开头,女士就对男士说,在决
传统的中国服饰较多地使用深色,所以庆典礼服(ceremonialclothing)倾向于深色,配以色彩明亮、精心设计的图案。普通老百姓日常生活中穿的最多的是浅色衣服。中国人将某些颜色与特定季节联系在一起:绿色代表春天,红色代表夏天,白色代表秋天,黑色象征
A、ItismoreexpensivetotakeatraintoOhio.B、FlyingtoOhiocan’tsavethewomanmuchtime.C、Thewomanhasdecidedtofly
Aroundtheworldmoreandmorepeoplearetakingpartindangeroussportsandactivities.Ofcourse,therehavealwaysbeenpeop
TheHistoryofEarlyCinemaA)Thehistoryofthecinemainitsfirstthirtyyearsisoneofmajorand,tothisday,unparalleled
随机试题
小雨自幼因生父母无力抚养,被王老伯依法收养,成年后,小雨与王老伯依法协议解除了收养关系,但未与生父母恢复权利义务关系,今日小雨生父病故。留下一笔债务,王老伯缺乏劳动能力没有生活来源,依据《民法典》,小雨应当()。
Inthissmalltowntherewasnotasinglemanofimportancewhowoulddaretohaveahousekeeperyoungerthansixty,forfearof
在我国晚育是指
施工总平面布置图的设计,必须依照一定的程序和步骤:①布置仓库;②布置加工厂和混凝土搅拌站;③布置临时水电管网;④引入场外交通道路;⑤布置内部运输道路;⑥布置临时设施。试选择正确的程序()。
明朝科举考试规定只能在四书五经中命题,五经是()。
某市公安局胜利派出所辖区内的天瑞社区实有人口23453人,社区内商业场所、学校等公共场所较为集中、临街商铺较多、餐饮娱乐业发达,社会内有1至5号共5个居民小区。下表是2017年4月22日至28日该社区各居民小区的警情登记表。针对4号小区的情况,派出所
科学发展观的核心是以人为本。但从近期发生的几起安全事故和突发事件不难发现,一些干部仍然把“以人为本”理念放在一边,对人民群众的生命财产极端不负责任。在急功近利思想的主导下,一些干部对明明需要纠正的事,却视而不见;明明按规定不能做的事,却照做不误;把人命关天
从鸦片战争到甲午战败.这个“数千年未有之大变局”的酿成乃是中国农耕文明_______与西方工业文明_______的双重结果。填入划横线部分最恰当的一项是:
①2016年,全世界共有2.16亿人患有疟疾,其中44.5万人不幸死亡②大约一周后,等到雌蚊再次进食的时候,疟原虫会随着它的唾液进入新的人类宿主体内,到达受害者的肝脏和血液,最终引发疾病甚至导致死亡③疟原虫会在蚊子体内繁殖,然后进入雌蚊的唾液
A、Becauseofhiscontributiontothechildrenasadentist.B、Becauseofhiseffortsasateacherofphotographtaking.C、Bemuse
最新回复
(
0
)