A rapid means of long-distance transportation became a necessity forthe Uni

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问题    A rapid means of long-distance transportation became a necessity for
the United States as settlement spread farther westward. For a long time
the railroad companies met with troubled mechanical problems. The most                                  【S1】 ________
serious were the construction of rails able to bear the load, and the development of the safe,
effective stopping system. Once these were solved,                                                    【S2】 ________
and the railroad was established as the best means of land transportation.                               【S3】 ________
By 1860 they had built thousands of miles of railroads crossing the eastern
mountain ranges and reaching westward in the Mississippi.
The high point in railroad building came by the construction of the                                  【S4】 ________
first transcontinental railroad. In 1862 Congress had authorized two                                     【S5】 ________
railroad companies to build lines from Nebraska westward and from
California eastward to a meeting point so as to complete a transcontinental
system. The Central Pacific Company, starting from California, used Chinese labor,
the Union Pacific employed crews of Irish laborers.                                                    【S6】 ________
The two groups worked at remarkable speed, each tried to cover a                                     【S7】 ________
greater distance than the other. In 1869, they met at a place called
Promontory. Many visitors came there for the great occasion. There
were joyous celebrations all over the country, with parades and the
ringing of church bells honor the great achievement.                                                    【S8】 ________
The railroad was very important in discouraging westward movement.                                     【S9】 ________
It also helped build up industry and farming by moving raw materials
and by distributing products rapid to distant markets.                                                 【S10】 ________ [br] 【S2】

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答案 the→a

解析语法错误。此处system是泛指且第一次提及，因此应使用不定冠词a。

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