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
23
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.
【B4】
选项
答案
fulfilled
解析
fulfill意为“实现”,与were构成被动语态,因而空格处要填入过去分词形式fulfilled。
转载请注明原文地址:https://jikaoti.com/ti/Ym6FFFFM
0
大学英语六级
相关试题推荐
Britishdoctorsaretolaunchamajorclinicaltrialtoinvestigatewhetheracommonanti-depressiondrugcouldbeacheapande
Americansusuallyconsiderthemselvesafriendlypeople.Theirfriendships,however,tendtobeshorterandmore【B1】______thanf
Americansusuallyconsiderthemselvesafriendlypeople.Theirfriendships,however,tendtobeshorterandmore【B1】______thanf
A、Totrysomethingdifferent.B、Totravelandmeetpeople.C、Tolearndifferentculture.D、Tosavemoney.B女士问男士搭便车是为了省钱还是出于别的原因
Thelocaleducationauthoritycompiledalistof"potentialsecurityproblems"oncampuslastweek.Theyincludefireaccidents,
A、Whenshegetsthebooks.B、Whentheclassesbegin.C、Whenshehandsintheform.D、Whensheisabletopay.A女士问男士何时付款,男士说在取书的
Thehomeisthecentralfocusofmostyoungpeople’slivesinBritain,particularlyforthosewhoarestillattendingschool.Th
Childrencanspendhoursadaylookingatcomputerscreensandotherdigitaldevices.Someeyecareprofessionalssayallthats
A、Herbusinessskills.B、Herstudyexperienceabroad.C、Hercriticalthinkingability.D、Herculturalknowledge.B短文开篇谈到,Ashley在
TheHistoryofEarlyCinemaA)Thehistoryofthecinemainitsfirstthirtyyearsisoneofmajorand,tothisday,unparalleled
随机试题
简述研究工具的信度和效度之间的关系。
配制100ml2%盐酸普鲁卡因溶液,需加入多少克氯化钠使其成等渗(1%盐酸普鲁卡因水溶液的冰点下降度为0.12,1%的氯化钠水溶液的冰点下降度为0.58)
阿尔茨海默病(AD)的确诊依据是
设α=i+2j+3k,β=i一3j一2k,与α、β都垂直的单位向量为()。
在催化剂中,能够使化学反应加快速度的称为正催化剂,使化学反应速度减慢的称为负催化剂,下列属于负催化剂的是:
根据《刑事诉讼法》规定,对于未成年人刑事案件,说法正确的是()。
下列各句中划线的成语使用恰当的一句是()。
有以下程序,程序运行后的输出结果是voidfun(int*p1,int*p2,int*s){s=(int*)malloc(sizeof(int));*s=*p1+*(p2++);}main(){inta[2]={
【139】来说,人们有这样一种观点,具有超群能力【140】对所应聘职位有极大热忱的应聘者更【141】在面试中取得成功。其实这是一种误解,在现实中常常有这种【142】,一个优秀人才并未在其擅长的工作【143】中找到理想的职位,相反一些能力和热情都远逊于前者的
TheBuildingofthePyramidsTheoldeststonebuildingsintheworldarethepyramids.(46).Thereareovereightyofthemsca
最新回复
(
0
)