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
2024-04-19
47
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/3562045.html
相关试题推荐
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
Forcenturiesmendreamedofachievingverticalflight.In400A.D.Chinese
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
JustlikeChinese,Westernersgivegiftsonmanyoccasions,suchas,onbirt
随机试题
Whenwetalkaboutintelligence,wedonotmeantheabilitytogetgoodscore
Forthispart,youareallowed30minutestowriteashortessayentitledOn
Forgetfit,tannedandsporty—thenewgenerationofAustraliansisfastbec
Rumoristhemost【C1】_____wayofspreadingstories—bypassingthemonfro
A公司为非上市公司,按年对外提供财务报告,有关股票投资业务如下(所得税税率为25
羊膜腔胎儿造影不能诊断的胎儿畸形是A.小耳症 B.单眼症 C.白化病 D.
A.水蛭 B.红花 C.血竭 D.益母草 E.川芎皆能活血调经,利水的药
语文教学中要恰当运用多种评价方式,下列做法不正确的是()。A.形成性评价和终结性
惠普金融的发展目标不包括( )。A.提高金融覆盖率 B.完善金融体系 C.提
关于定价增发操作流程,假设T日为网上网下申购日,下列说法中正确的有()。A:T-
最新回复
(
0
)