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The conquest of Distance 1 In 1848, pioneers who crossed the American continent in their

The conquest of Distance

1 In 1848, pioneers who crossed the American continent in their wagons made the trip in 109 days. Today a New York family can drive by automobile to San Francisco in less than a week or make the trip several days by train, or fly there in five hours. The transportation has conquered the vastness of the land and trought together people living thousands of kilometers apart.

2 Railroads played a major role in uniting the far reaches of the continent. In 1830 there were only 37km of railroad track in the United States. But by 1863, two companies proposed to connect the east and west coast by a railroad all the way across the continent. Advancing eastward from California, the Central Pacific pushed forward across the desert; the Central Pacific moved slowly westward over the mountain plateaus. Finally, in 1869, the tracks of the two railroads met, and the first transcontinental railroad-the first real link between east and west –was completed.

3 Although the railroads brought towns and cities together, they could not go everywhere. In many parts of America, distances are so great that automobiles are necessities, not luxuries. As we have noted, most American frmers do not live in villages but are sometimes kilometers from their nearest neighbor and even hundreds of kilometers from a town. Large-scale farming is common in many parts of the United States today, but it did not become profitable until there were trucks and tractors. Trucks and cars go wherever there is a road and the more than six million kilometers of roads bring every field and bam into the circle of civilization.

4 The family automotile has helped to bring people of the United States two other things-two things which can seldom exist at the same time:community life and the privilege of privacy. In the early days of industrialization, factory workers lived close together,within walking distance of ther jobs as industries grew,more and more working lass families lived together in crowded conditions. But with the construction of longer and better roads and with the greater availability of automobiles and other means of rapid transportation,it was no longer to live close to the factory. New residential areas, suburbs, trew up outsidethe big cities and increasingly, industry and commerce concentrated in the cities. Every morning, millions of Americans dive their automobiles to work in the city, sometimes a distance of around 100 kilometers. At night they drive home to houses and apartments outside the cities, surrounded by trees and lawns.

5 Automobies and other methods of rapid transportation are also changing American industry. Instead of continuing to concentrate in the bit cities, industry is buiding factories in previously undeveloped areas. Because the means of transportation are available, it is not hard to transport people as well as materials to the places where they are needed. This factor was largely responsible for the

A Automobiles promote farming.

B Planes bring people even closer.

C Railroads unite the whole country.

D Buiding railroads is costly.

E Transportation makes it possible for workers to move out of cities.

F People can travel all over the world.

第23题 paragraph 2

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更多“The conquest of Distance 1 In 1848, pioneers who crossed the American continent in their”相关的问题

第1题

距离查询命令是()。

A.dist

B.id

C.area

D.dim

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第2题

已知a=dist(name=‘alice’,age=42),则d[‘age’]的值为()。

A.2

B.1

C.3

D.42

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第3题

下列关于E Charts安装独立版本,描述错误的是()?

A.ECharts不区分完全版、常用版、精简版

B.echarts/dist/echarts.common.js是常用版,体积适中,包含常见的图表和组件

C.echarts/dist/echarts.simple.js是精简版,体积较小,仅包含最常用的图表和组件

D.echarts/dist/echarts.js是完全版,体积最大,包含所有的图表和组件

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第4题

Invasion is a new strategic game where you _______the world with bloody battles of anc

A.would conquest

B.confused

C.will conquest

D.conclude

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第5题

A.executionB.campaignC.reactionD.conquest

A.execution

B.campaign

C.reaction

D.conquest

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第6题

Norman Conquest began inA.1066.B.1016.C.871.D.446.

Norman Conquest began in

A.1066.

B.1016.

C.871.

D.446.

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第7题

在使用EVA-625软件分析所测得的电梯图像数据时,要想在最上方的窗口中显示行程时间关系曲线图,应在命令栏中点击图标()。
在使用EVA-625软件分析所测得的电梯图像数据时,要想在最上方的窗口中显示行程时间关系曲线图,应在命令栏中点击图标()。

A、Dist/位移

B、Vel/速度

C、Accel/加速度

D、Jerk/加加速度

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第8题

A.Observing the conquest of "Nian".B.Scare the beast "Nian".C.A form. to thank the old

A.Observing the conquest of "Nian".

B.Scare the beast "Nian".

C.A form. to thank the old man.

D.Red is the festival color.

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第9题

The Anglo-Saxon Conquest was important in English history because it laid the foundat
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第10题

假设你想如同例6.3那样估计出勤率对学生成绩的影响。一个基本模型是:其中变量定义与第6章相同。(
假设你想如同例6.3那样估计出勤率对学生成绩的影响。一个基本模型是:其中变量定义与第6章相同。(

假设你想如同例6.3那样估计出勤率对学生成绩的影响。一个基本模型是:

假设你想如同例6.3那样估计出勤率对学生成绩的影响。一个基本模型是:其中变量定义与第6章相同。(假设

其中变量定义与第6章相同。

(i) 令dist为学生住宿区到教学大楼的距离。你认为dist与u不相关吗?

(ii) 假定dist与u不相关, 要成为a in dr le的一个有效IV, dist还必须另外满足什么假定?

(iii) 假定我们如在方程(6.18) 中一样增添交互项pri GPA-at nd rte:

假设你想如同例6.3那样估计出勤率对学生成绩的影响。一个基本模型是:其中变量定义与第6章相同。(假设

若ct nd rte与u相关, 则一般认为pri GPA也与u相关。priG PAra tnd rte的一个好I将是什么呢?[提示:若E(ul pri GPA, ACT, dst) =0(在pri GPA、ACT、dst均外生时出现) , 则pri GPA和dit的任何函数都与u不相关。]

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第11题

When did the Norman Conquest take place?A.1066B.1100C.450D.449

A.1066

B.1100

C.450

D.449

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