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
46
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
"Almostuniversally,womenhavefailedtoreachleadingpositionsinmajor
Accordingtolegend,theancientOlympicGameswerefoundedbyHeracles,a
关于决定和决议,下列说法正确的有()。A.决议必须经会议表决通过才能行文,决定
产气荚膜梭菌属于A.革兰阳性球菌 B.革兰阳性杆菌 C.革兰阴性杆菌 D.
收受订金的一方不履行约定的债务的,应当双倍返还定金。( )
A.肝病及心 B.肝病及肾 C.肝病及肺 D.肝病及脾 E.脾病及心属五
治疗肺气虚耗所致喘证,应首选A.生脉散合补肺汤 B.金水六君煎 C.六
泻下药的适应病证有A.大便秘结 B.湿阻中焦 C.胃肠积滞 D.水肿停饮
为中毒病人洗胃时应注意A.毒物进入体内时间在4~6h之内应洗胃,任何毒物在体内超
评价等级为二级的建设项目位于黄土地区,缺乏近3年内地下水位动态监测资料和水质监测
最新回复
(
0
)