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
2024-03-01
4
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 the earth as rotation ceased. Leonardo da Vinci conceived the first mechanical apparatus, called a "Helix", which could carry a man straight up, but this was only a design and was never tested.
The ancient dream was finally realized in 1940 when a Russian engineer piloted a strange looking craft of steel tubing with a rotating fan on top. It rose awkwardly and vertically into the air from a standing start, hovered a few feet above the ground, went sideways and backwards, and then settled back to the earth. That vehicle was called a helicopter.
Imaginations were fired. Men dreamed of going to work in their own personal helicopters. People anticipated that vertical flight transports would carry millions of passengers as do the airliners of today. Such fantastic expectations were not fulfilled. The helicopter has now become an extremely useful machine. It excels in military missions, carrying troops, guns and strategic instruments where other aircraft cannot go. Corporations use them as airborne offices, many metropolitan areas use them in police work, construction and logging companies employ them in various advantageous 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 accessible to crews and supplies. Any urgent mission to a hard-to-get-to place is a likely task for a helicopter. Among their other multitude of uses: deliver people across town, fly to and from airports, assist in rescue work, and aid in the search for missing or wanted persons. [br] According to the passage, people expect that______.
选项
A、helicopters could eventually replace the airliners of today
B、their imaginations fired by the Russian engineer’s invention would be realized in the future
C、their fantastic expectations about helicopters could be fulfilled by airliners of today
D、helicopters would someday be able to carry millions of people from place to place as airliners are now doing
答案
D
解析
根据文中第三段中的第二句话,人们期望直升机能像今天的客机一样运载许多的乘客。因此,正确答案是D项。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3496465.html
相关试题推荐
ChineseandAmericansliterallyviewtheworlddifferentlyaccordingtoane
WhatdidChinesepeopleusuallyhaveforbreakfast15yearsago?[br]Whatisth
WhatdidChinesepeopleusuallyhaveforbreakfast15yearsago?[br]Whichoft
WhatdidChinesepeopleusuallyhaveforbreakfast15yearsago?[br]According
WithmoreChinesechildrencomingtostudyinSingapore,auniquecommunityofw
WithmoreChinesechildrencomingtostudyinSingapore,auniquecommunityofw
WithmoreChinesechildrencomingtostudyinSingapore,auniquecommunityofw
WithmoreChinesechildrencomingtostudyinSingapore,auniquecommunityofw
WithmoreChinesechildrencomingtostudyinSingapore,auniquecommunityofw
WithmoreChinesechildrencomingtostudyinSingapore,auniquecommunityofw
随机试题
[originaltext]W:Youhaven’tseenmygymbag,haveyou?M:Haveyoucheckedba
"Congratulations,Mr.Jones,it’sagirl."Fatherhoodisgoingtohavea
Solittle______aboutChinathathecouldnotfindBeijingintheworldmap.A、t
城区内生活出行,采用步行与自行车交通的出行比例不宜低于( )。A.70% B
可防治晕动病的是A.东莨菪碱 B.新斯的明 C.山莨菪碱 D.丙胺太林
1997-160.患者突然昏倒,不省人事,牙关紧闭,肢体强痉,躁扰不宁,二便
下列哪一种疾病最容易引起晕厥A.肥厚梗阻型心肌病 B.肥厚非梗阻型心肌病 C
某经营机构于2016年3月20日与客户王某签定了一份期货经纪合同。经查,该机构不
中药注射剂一般不宜制成A.溶液注射剂 B.乳状液注射剂 C.无菌粉末 D.
下列关于建设项目建筑工程方案的说法,错误的是()。A.建筑工程方案要研究论证主
最新回复
(
0
)