首页
登录
职称英语
The bicycle was not invented by one individual or in one country. It took ne
The bicycle was not invented by one individual or in one country. It took ne
游客
2024-08-09
4
管理
问题
The bicycle was not invented by one individual or in one country. It took nearly 100 years and many individuals for the modem bicycle to be born. By the end of those 100 years, bicycles had revolutionized the way people traveled from place to place.
【R1】________These early bicycles had two wheels, but they had no pedals. The rider sat on a pillow and walked his feet along the ground to move his velocipede forward.
Soon a French inventor added pedals to the front wheel. Instead of walking their vehicles, riders used their feet to turn the pedals. However, pedaling was hard because velocipedes were very heavy. The framework was they had no pedals. The rider sat on a pillow and walked his feet along the ground to move his velocipede forward.
Soon a French inventor added pedals to the front wheel. Instead of walking their vehicles, riders used their feet to turn the pedals. However, pedaling was hard because velocipedes were very heavy. The framework was made of solid steel tubes and the wooden wheels were covered with steel. Even so, velocipedes were popular among rich young men, who raced them in Paris parks.
Because velocipedes were so hard to ride, no one thought about using them for transportation. People didn’t ride velocipedes to the market or to their jobs. Instead, they thought velocipedes were just toys.
【R2】________They began building velocipedes, too, but with one difference. They made the frameworks from hollow steel tubes. This alteration made velocipedes much lighter, but riders still had to work hard to pedal just a short distance. In addition, roads were bumpy, so steering was difficult. In fact, most riders preferred indoor tracks where they could rent a velocipede for a small fee and take riding lessons.
【R3】________They saw that when a rider turned the pedals once, the front wheel turned once. If the front wheel was small, the bicycle traveled just a small distance with each turn. They reasoned that if the front wheel were larger, the bicycle would travel a greater distance. So they designed a bicycle with a giant front wheel. They made the rear wheel small. Its primary purpose was to help the rider balance.
Balancing was hard because the rider had to sit high above the giant front wheel in order to reach the pedals. This meant he was in danger of falling off the bicycle and injuring himself if he lost his balance. Despite this inherent danger, "high wheelers" became very popular in England.
【R4】________Their goal was to make a safer bicycle. They substituted a small wheel for the giant front wheel and put the driving mechanism in a larger rear wheel. It would be impossible for a rider to pedal the rear wheel, so engineers designed a system of foot levers. By pressing first the right one and then the left, the rider moved a long metal bar up and down. This bar turned the rear axle. This axle turned the rear wheel and the bicycle moved forward. Because the new safety bicycle minimized the dangers inherent in bicycle riding, more and more people began using bicycles in their daily activities.
【R5】________They made the two wheels equal in size and created a mechanism that uses a chain to turn the rear wheel. With this final change, the modern bicycle was born.
Subsequent improvements, such as brakes, rubber tires, and lights were added to make bicycles more comfortable to ride. By 1900, bicycle riding had become very popular with men and women of all ages. Bicycles revolutionized the way people traveled. Today, millions of people worldwide ride bicycles for transportation, enjoyment, sport and exercise.
A. The British altered the design one last time.
B. People in Pairs paid a fee to ride velocipedes to their jobs.
C. Bicycles first appeared in Scotland in the early 1800s, and were called velocipedes.
D. American manufacturers once again tried to design a better bicycle.
E. Riders must be good athletes to meet the physical demands that are an inherent part of a long race.
F. Around 1870, American manufacturers saw that velocipedes were very popular overseas.
G. Subsequent changes by British engineers altered the wheels to make pedaling more efficient. [br] 【R4】
选项
答案
D
解析
该空后面提到“由于新型安全自行车将骑车的危险降到最小,因此越来越多的人开始在日常活动中使用自行车。”由此可知,该空应该与设计出一种更安全的自行车有关,符合条件的只有D项。
转载请注明原文地址:https://tihaiku.com/zcyy/3712099.html
相关试题推荐
SomeseeIQtestsasanassessmentofanindividual’sproblem-solving
Thebicyclewasnotinventedbyoneindividualorinonecountry.Ittookne
Thebicyclewasnotinventedbyoneindividualorinonecountry.Ittookne
Themanwhoinventedthemdoesn’twantone.Amanwhoboughtonedoesn’tneedit
Someindividualsandcitizens’groupshaveexpressedconcernaboutthelevel
Someindividualsandcitizens’groupshaveexpressedconcernaboutthelevel
Sincemovingpictureswereinventedacenturyago,anewwayofdistributing
Sincemovingpictureswereinventedacenturyago,anewwayofdistributing
Sincemovingpictureswereinventedacenturyago,anewwayofdistributing
Sincemovingpictureswereinventedacenturyago,anewwayofdistributing
随机试题
Nowadaysmostofpeoplebuyahouseonhirepurchaseandpaidmonthly_______.A、
在生活中,人们往往需要找到生命的意义和目标。每个人在一生中都需要一些目标指引他们的方向(direction)。因此,他们的生活需要有既定的目标,并且努力
Mostpeoplefeellonelysometimesbutitusuallylastsonlybetweenafewmi
需摄取腕关节尺侧偏展位的是A.掌骨骨折 B.克雷骨折 C.三角骨病变 D.
A.维生素B B.维生素B C.维生素B D.泛酸 E.维生素PPTPP
SMA非改性沥青玛蹄脂碎石混合料动稳定度的技术标准要求不小于()。A.600次
氟普噻吨不适用于A.更年期抑郁症B.焦虑性神经官能症C.躁狂症D.伴有焦虑的精神
材料题:小赵、小钱、小孙、小吴、小陈5个人要买电影票,买的电影票的座位号是1、2
腭侧有下列神经吻合A.上牙槽前神经与上牙槽中神经 B.鼻腭神经与腭中神经 C
某建筑公司承建商业大厦,在进行混凝土浇筑作业时,工人王某发现振捣棒开动后漏电开关
最新回复
(
0
)