单选题 The early railroads were connected short lines in the existing arteries of transportation: roads, turnpikes, canals, and other waterways.
A. short lines that connected B. those short fines connected
C. connected by short lines D. short connected lines

【正确答案】 A

【答案解析】[解析] 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。