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
10
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] 【R1】
选项
答案
C
解析
该空后面提到“这些早期的自行车有两个轮子,但没有踏板。”由此可知,该空应该与最早的自行车出现有关,符合条件的只有C项。
转载请注明原文地址:https://tihaiku.com/zcyy/3712096.html
相关试题推荐
Anycatordogownerwilltellyouthattheirpethasanindividualpersonali
Acoldbathmakestheindividuallesssusceptibletocommoncold.冷水浴可以使人不易患感冒。
Asoldiershouldbeloyaltohiscountry.军人应该效忠祖国。冠词是英语中特有的词类,往往并不表达具体的词义,而只是为了满
Individualscanandshouldmaketheirownlegaldecisions______whotheiremploye
Thebicyclewasnotinventedbyoneindividualorinonecountry.Ittookne
Thebicyclewasnotinventedbyoneindividualorinonecountry.Ittookne
Thebicyclewasnotinventedbyoneindividualorinonecountry.Ittookne
Thebicyclewasnotinventedbyoneindividualorinonecountry.Ittookne
Themanwhoinventedthemdoesn’twantone.Amanwhoboughtonedoesn’tneedit
Someindividualsandcitizens’groupshaveexpressedconcernaboutthelevel
随机试题
Somepeoplemayovereatbecausethey’reunabletotasteand【B1】______thefat
Completethenotesbelow.WriteNOMORETHANTWOWORDSAND/ORANUMBERforeach
证明:二次型在时的最大值为矩阵A的最大特征值
空肠造瘘管饲流质最佳温度是()A.38℃ B.41℃ C.39℃
2011年3月日本大地震期间,一位信息技术教师为了让学生掌握利用全文搜索引擎搜索
公债的推销机构有()。A.税务机关 B.金融机构 C.中央银行 D.邮政
天王星:地球:行星A.杜鹃:布谷鸟:啼血鸟 B.堡礁:暗礁:珊瑚礁 C.太
下列哪些属于企业信用分析的5Cs系统的分析范围?()A.借款人的个人品德
建筑遮阳的效果用()来衡量,建筑遮阳设计是建筑节能设计的一项重要内容。A.
钢材的塑性指标通常用()表示。A.屈服强度 B.抗拉强度 C.伸长率 D
最新回复
(
0
)