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题库 / BiChu21-SC-110
At the beginning of the railroad era, in the second quarter of the nineteenth century, very few people believed in a locomotive having smooth wheels on a smooth track that it could pull cars around a curve or up more than merely a trifling grade.
in a locomotive having smooth wheels on a smooth track that it could pull cars around a curve or up more than
in a locomotive having smooth wheels and with a smooth track could pull cars around a curve or up more than
that a locomotive with smooth wheels and with a smooth track could pull cars around a curve or up more than
that a locomotive with smooth wheels on a smooth track could pull cars around a curve or more than up
that a locomotive with smooth wheels on a smooth track could pull cars around a curve or up more than