The greatest road system built in the America prior to the arrival of Christopher Columbus was the Incan highway,which,over 2,500 miles long and extending from northern Ecuador through Peru to Southern Chile.
B Columbus was the Incan highway,over 2,500 miles in length,and etended
E Columbus,the Incan highway was over 2,500 miles long,extending
B有什么错啊,不能用in length?
E不是重心转移了吗 |