The early railroads were connected short lines in the existing arterie-考呗网

单选题The early railroads were connected short lines in the existing arteries of transportation: roads，turnpikes，canals，and other waterways．

[分析]结构应用
本句意为：早期的铁路是些连接已有运输干线的短线，已有的运输干线指公路、收费公路、运河和其他一些水路。主句强调：早期的铁路是些短线，定语“连接已有运输干线的”是修饰short lines的，因此A为答案。

1The computer has dramatically affected just like photographic lenses are constructed．

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3When people have no will to live, people are often very difficult to help.