首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Why is the wheel important?
Why is the wheel important?
admin
2010-06-30
46
问题
Why is the wheel important?
Man’s first real invention, and one of the most important inventions in history, was the wheel. All transportation and every machine in the world depends on it.
The wheel is the simplest yet perhaps the most remarkable of all inventions, because there are no wheels in nature - no living thing was ever created with wheels. How, then, did man come to invent the wheel?
Perhaps some early hunters found that they could roll the carcass of a heavy animal through the forest on logs more easily than they could carry it. However, the logs themselves weighed a lot.
It must have taken a great prehistoric thinker to imagine two thin slices of log connected at their centers by a strong stick. This would roll along just as the logs did, yet be much lighter and easier to handle. Thus the wheel and axle came into being, and with them the first carts.
选项
A、It is simple.
B、It is complicated.
C、It is strange.
D、It is unusual.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/wLJd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
HowdoesSerkis’versiondifferfromtheoriginalone?
YouwillhearatalkaboutFrenchelementaryschools.Asyoulisten,answerQuestions1to10bycirclingTRUEorFALSE.Youwil
ItisinterestingtoreflectforamomentuponthedifferencesintheareasofmoralfeelingandstandardsinthepeoplesofJap
HotelswereamongtheearliestfacilitiesthatboundtheUnitedStatestogether.Theywerebothcreaturesandcreatorsofcommun
Periodicallyinhistory,therecomeperiodsofgreattransitioninwhichworkchangesitsmeaning.Therewasatime,perhaps10,
What’stheaverageincreaseperyearofforeignstudentpopulationintheperiodbetween1985and1990intermsofpercentage?
Thethreatofdiseasessuchasinfluenzaortuberculosisre-emerginginvirulentformhasbeenacommonthemeinrecentyears.T
Inpopulardiscussionsofemissions-rightstradingsystems,itiscommontomistakethesmokestacksforthetrees.Forexample,
Inpopulardiscussionsofemissions-rightstradingsystems,itiscommontomistakethesmokestacksforthetrees.Forexample,
Hawaii,theneweststateintheUnitedStates,isa【C1】______ofeightlargeislandsandmanysmall【C2】______intheCentral
随机试题
简述控制食品中农药和兽药残留量的措施。
原始人在身体上刻痕、刺纹、穿耳、穿鼻等装饰活动,属于()
关于预防子宫内膜异位症的发生,下列错误的是()
高选择性迷走神经切断术毕I式手术
患者女性,29岁,既往肺结核病史2年。近1周来气急、胸闷,刺激性咳嗽。胸部X线平片显示左侧肋膈角变钝,估计胸腔积液的量至少有多少
库存量控制的目标是使物流总成本最低,以下没有涉及的成本是( )。
某日,一农货市场商户发生斗殴,巡警到现场制止,遭到手持钢管的高某袭击,鸣枪警告无效后,巡警开枪将其制服。上述体现公安机关的性质是:
利用变换y=f(ex)求微分方程y"一(2ex+1)y’+e2xy=e3x的通解.
已知f(x)=x2-x∫02f(x)dx+2∫01f(x)dx,试求f(x).
Everycountryhassecretservicestohelpprotectitagainstseriousthreatsfromterrorists,majorcriminalsorevenfromother
最新回复
(
0
)