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下列选项中，（）是房地产交易过程中最容易暴露问题和产生矛盾的一环。 A．产权过户 B．产权登记 C．物业交接 D．售后服务

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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

根据选项，回答第 129～130 题。
第 129 题与急性皮肤病有关的是

高压系统短路电流计算条件有（）。A．电力系统中所有发电机电动势相角都认为相同（大多数情况下相角高压系统短路电流计算条件有（）。A．电力系统中所有发电机电动势相角都认为相同(大多数情况下相角很接近)B．电路电容和变压器的励磁电流不能略去不计C．设定短路回路各元件的磁路系统为不饱和状态，即认为各元件的感抗为一常数。若电网电压在6kV以上时，除电缆线路应考虑电阻外，网络阻抗一般可视为纯电抗(略去电阻)：若短路电路中总电阻尺∑大于总电抗χ∑的1/3，则应将其计入有效电阻D．具有分接开关的变压器，其开关位置视为在主分接位置

“水火既济”是指哪两脏的关系