单项选择题
A．they could travel by wagons B．they could ride on their tame animals and go across water in hollowed tree trunks C．the roads were splendid D．the climates were favorable
A．memorized his orders B．recited his orders C．tried to remember his orders D．repeated his orders himself
A．got rid of the plans quickly B．lost the plans C．threw the plans away D．managed to save the plans