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(1)
A)Because they were driven by steam power.
B)Because they did the work that animals used to do.
C)Because they pulled cars full of coal.
D)Because they were made of iron.
(2)
A)He wanted the railroad to the successful.
B)He wanted to have a more powerful steam engine.
C)He wanted to own the land near the railroad.
D)He wanted to build his own railroads.
(3)
A)Because the train could not run as fast as the horse.
B)Because the engine failed to build up steam.
C)Because the engine broke down and the train stopped.
D)Because the engine broke into several parts.
