首页
登录
职称英语
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese
游客
2023-08-21
50
管理
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. [br] 【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://tihaiku.com/zcyy/2945781.html
相关试题推荐
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
Forcenturies,farmershaveusedwindmillstopumpwater,crushgrainandpe
随机试题
TheAmericanTwo-partySystemI.IntroductionA.theoldest
DawnaWalterisoneoftheauthorsleadingthewayinBritainwithherbook
下列合同中,既可以是有偿合同也可以是无偿合同的有( )。A.买卖合同 B.借
列表比较三种类型的通气障碍的通气功能指标改变。
隐形课程是指学校计划课程中未明确规定的、非正式和无意识的学习经验。根据上述定义下
股票指数是反映和衡量所选择的一组股票的价格的平均变动的指标。()
关于优等劳动力市场和次等劳动力市场的说法,正确的是()。A.优等劳动力市场形
下列网络营销活动中,属于即时通讯营销的是()。A.论坛发帖宣传 B.博客宣传
OECD于2015年10月发布税基侵蚀和利润转移项目全部15项产出成果。下列各项
甲公司职工周某的月工资为6800元。已知当地职工基本医疗保险的单位缴费率为
最新回复
(
0
)