首页
登录
职称英语
Bird wings have a much more complex job to do than the wings of an airplane,
Bird wings have a much more complex job to do than the wings of an airplane,
游客
2025-05-01
29
管理
问题
Bird wings have a much more complex job to do than the wings of an airplane, for in addition to supporting the bird they must act as its engine, rowing it through the air. Even so the wing outline or a bird conforms to the same aerodynamic principles as those eventually discovered by people when designing airplanes, and if you know how different kinds of aircraft perform, you can predict the flight capabilities of similarly shaped birds.
Short, stubby wings enable a tanager and other forest-living to swerve and dodge at speed through the undergrowth, just as they helped the fighter planes of the Second World War to make tight turns and acrobatic maneuvers in a dog-fight. More modern fighters achieve greater speeds by sweeping back their wings while in flight, just as peregrines do when they go into a 130kph dive, swooping to a kill. Championship gliders have long, thin wings so that, having gained height in a thermal up-current they can soar gently down for hours and an albatross, the largest of flying birds, with a similar wing shape and a span of 3 meters, can patrol the ocean for hours in the same way without a single wing beat. Vultures and hawks circle at very slow speeds supported by a thermal and they have the broad rectangular wings that very slow-flying aircraft have. People have not been able to adapt wings to provide hovering flight. That has only been achieved with the whirling, horizontal blades of a helicopter or the downward-pointing engines of a vertical landing jet. Hummingbirds have paralleled even this. They tilt their bodies so that they are almost upright and then beat their wings as fast as 80 times a second producing a similar downdraft of air. So the hummingbird can hover and even fly backwards. [br] Which of the following is NOT true according to the passage?
选项
A、Bird wings have to support the bird.
B、Bird wings must act as the bird’s engine.
C、Airplane’s wings must act as the airplane’s engine.
D、Similar wing shapes in aircraft and birds produce similar flight capabilities.
答案
C
解析
题目问:根据文章内容,哪项不是真实的?第一段“Bird wings have a much more complex job to do than the wings of an airplane,for in addition to supporting the bird they must act as its engine,rowing it through the air.”通过这句话可知,与飞机的机翼相比,鸟的翅膀的功能更复杂,它能支持鸟体,还是鸟飞翔的引擎。据此判断,应选择C。
转载请注明原文地址:https://tihaiku.com/zcyy/4057727.html
相关试题推荐
Millionsoftonsofwaterare______byacomplexsystemofdykes.A、heldupB、held
Birdwingshaveamuchmorecomplexjobtodothanthewingsofanairplane,
Birdwingshaveamuchmorecomplexjobtodothanthewingsofanairplane,
Birdwingshaveamuchmorecomplexjobtodothanthewingsofanairplane,
Thesourcesofanti-Christianfeelingweremanyandcomplex.Onthemoreint
Thesourcesofanti-Christianfeelingweremanyandcomplex.Onthemoreint
Thesourcesofanti-Christianfeelingweremanyandcomplex.Onthemoreint
Thesourcesofanti-Christianfeelingweremanyandcomplex.Onthemoreint
Permissiontobuildthefactoryhasbeendelayedbythecomplex______betweeni
Moderncomplexsocietiesaretroubledbyalackofconsensusaroundmanyiss
随机试题
在中国,水稻生产是国民经济的重要组成部分。中国人早在公元前4000年就开始了水稻种植,而后逐渐传播到世界各地。目前,中国是世界上最大的水稻生产国,水稻产
AzharUsman,astand-upcomic,saysheisa"verypatriotic"AmericanMuslim
下列各项属于拥有上市公司控制权的有( )。 Ⅰ持有上市公司51%股权的股东
A.完带汤B.四神丸C.易黄汤D.固冲汤E.生化汤脾肾虚弱,蕴湿生热之带下,宜选
针对甲亢的患者,下列哪项饮食不妥?( )A.高碘饮食 B.高热量饮食 C.
所有工作人员(包括工作负责人)不许单独进入、滞留在()。 A.高压室
甲午战争一役,洋务派经营多年的北洋海军全军覆没,标志着以“自强”“求富”为目标的
辛亥革命的局限性主要表现在( ) A.没有提出彻底的反帝反封建革命纲领 B
上级法院对下级法院已经发生法律效力的判决和裁定,如果发现有错误,有权提审或指令下
合成甘油磷脂的直接原料有( )。A.胆碱 B.丝氨酸 C.肌醇 D.谷氨
最新回复
(
0
)