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Without transportation, there could be no trade. Without trade, there could be no towns and cities. Towns and cities are traditionally the ___16___ of civilization. Therefore, transportation helps make civilization ___17___ .
Throughout most of the prehistoric period, people lived by hunting, fishing, and ___18___ wild plants. They had no beasts of burden, wheeled vehicles, or roads. People traveled ___19___ and carried their infants and belongings strapped to their backs or heads. Loads too heavy for one person to carry were strapped to a pole and carried by two people.
___20___ , people learned that they could drag loads along the ground on sledges. During late prehistoric times, people began to build sledges with runners. When people developed agriculture and began to establish ___21___ settlements, trade between settlements
started to develop, which created a need for better ___22___ of transportation. The donkey and the ox, which had been tamed for food products and farm work, helped ___23___ this need. The use of donkeys and oxen as beasts of burden enabled people to ___24___ heavier loads than they could before.
People also began to develop water transportation during prehistoric times. They built rafts of such __25____ as logs or reeds. Later, people learned ___26___ to make dugouts and canoes. People paddled these early craft with their hands
or propelled them with paddles or __27____.
The wheel was invented about 3500 B.C. and sailboat about 3200 B.C. Wheeled vehicles and sailing vessels ___28___transportation. But the speed of transportation improved only ___29___ over the centuries. Inventors produced the first engine- ___30___ vehicles during the late 1700’ s and the early 1800’ s. This development marked the beginning of a revolution in transportation that has continued to the present.
16. A. highlights B. pinpoints C. headquarters D. centers
17. A. possible B. acceptable C. practical D. typical
18. A. growing B. gathering C. watering D. moving
19. A. in turn B. at ease C. on foot D. for fun
20. A. All the while B. For a while C. In time D. On time
21. A. temporary B. permanent C. regular D. steady
22 A. knowledge B. judgment C. standards D. means
23. A. recognize B. develop C. meet D. reduce
24. A. bear B. move C. share D. lift
25. A. materials B. styles C. items D. types
26. A. where B. when C. how D. as
27. A. poles B. sails C. currents D. winds
28. A. demonstrated B. revolutionized C. witnessed D. initiated
29. A. considerably B. continuously C. swiftly D. slightly
30. A. powered B. controlled C. oriented D. related
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现代政府管理对流程，特别是____________(即管理程序 )有着特殊的依赖性。
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从我国BtoB电子商务平台的现状来看，主要分为信息平台、商务平台和____________。
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孙桓子还于新筑，不入，遂如晋乞师。
“如”意义：______
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曹七巧是作品( )中的人物。
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______是从一个Web页到另一个相关Web页的唯一途径，它由锚链和URL引用两部分组成。
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按照麦克卢汉的观点，收音机是____的延伸。
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试题">设3元非齐次线性方程组Ax=b有解α1，且 r(A)=2 ，则Ax=b的通解是
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______常常在项目中充当以下角色：决策人、商务发起人、业务专家、支持人员。
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根据威廉姆森的理论，可以将物流系统的治理结构分为：_________ 、三边治理、双边治理和_________ 。