首页
登录
职称英语
Ultralight(超轻型的) airplanes are a recent development in aviation that provid
Ultralight(超轻型的) airplanes are a recent development in aviation that provid
游客
2024-10-16
0
管理
问题
Ultralight(超轻型的) airplanes are a recent development in aviation that provide what aviation enthusiasts have long been seeking: an inexpensive airplane that is easy to fly. The ultralight plane was born of the marriage of the hang glider and the go-kart(微型单座赛车) engine around 1974, when John Moody mounted a 12-horsepower go-kart engine on his Icarus Ⅱ hang glider.
Today’s ultralights are not just hang gliders with engines; they are" air recreation vehicles". Modem ultralight planes use snowmobile(雪地机动车)engines that let them cruise at about 50 miles per hour, climb at about 500 feet per minute, and carry combined payloads of pilot and fuel up to about 200 pounds, which is about equal to an ultralight plane’s weight when empty. More than ten thousand ultralight planes were sold last year at prices ranging from $ 2,800 to $ 7,000. But the main reason for the increasing popularity of these aircraft is not that they are inexpensive, but that they are fun to fly.
The modern ultralight plane would look very familiar to the earliest pioneers of aviation. Otto Lilienthal made more than 2000 flights in Germany in the 1890’s in what were actually hang gliders. Octave Chanute designed and built many early hang gliders. Augustus Herring, Chanute’s assistam, used these gliders as models for a glider that he built for him self. On this glider, Herring installed a compressed-air motor and flew 267 feet in 1898. The Wright brothers’ Flyer was the grandfather of today’s ultralight plane. The pilot sat right out in the open, just as in modem ultralights, and used con trois that were much the same as those used in today’s machines.
Though most ultralight planes are used for pleasure flying, some are also used for crop dusting, aerial photography, and even military observation service. The likelihood is that further uses will be found for ultralight planes, but their greatest use will continue to be as air recreational vehicles. [br] According to the passage, today’s ultralight airplanes ______.
选项
A、are inexpensive but difficult to fly
B、are more like go-karts than like hang gliders
C、cannot climb as fast or as high as hang gliders
D、are not too different from the earlier aircraft
答案
D
解析
根据第一段第一句中的easy to fly可以排除A。从历史上看,超轻型飞机是hang glider和go-kart engine的结合,但作者没有表达B项内容,无法如此判断;C项内容也无法判断。而根据第三段第一句,我们可以确定D为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3803074.html
相关试题推荐
Whentravelling,youareadvisedtotaketravellers’checks,whichprovideasec
______MasterCardusersareNOTaffectedbytherecentsecuritybreach.[origina
Inrecentyearsmoreandmorecompanieshaveinvolvedinthetideofincorp
TheEthicalConsumerResearchAssociationwillprovideinformationtoshopperso
TheEthicalConsumerResearchAssociationwillprovideinformationtoshopperso
TheEthicalConsumerResearchAssociationwillprovideinformationtoshopperso
Itwasrecentlyreportedinanewspaperthatsixstudentswhosharedadorm
People’stastesinrecreationdifferwidely.Atarecentfestivalofpopmus
People’stastesinrecreationdifferwidely.Atarecentfestivalofpopmus
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thce
随机试题
Morethanfiftyyearsago,theUnitedNationsdeclaredthatliteracyisaba
Skipthatthirdhelpingofroastbeef,savetheplanetanddoyourheartaf
Englishhasbeensuccessfullypromoted,andhasbeeneagerlyadoptedinthe
[originaltext]M:HowdoyoulikeProfessorBookman’scourseontheHistoryofP
对于折线滑动面,从滑动面倾斜方向和倾角考虑,下列哪些选项条件有利于稳定?()
关于宫内节育器的取出时间,下列说法正确的A、阴道出血多者,应止血后才能取出 B
根据《人民防空法》的规定,()等重要的经济目标,应列为规划重点防护目标。A.
小吕大学毕业找工作时不仅考虑到工资水平,而且还考虑到职业发展前途、企业声誉等因素
某企业为增值税小规模纳税人,本月销售商品收入41200元(含税)。计算本月应缴纳
慢性支气管炎有小气道阻塞时,最敏感的肺功能检查指标是A、第一秒用力呼气量占用力肺
最新回复
(
0
)