单项选择题
A．they found it no use doing so B．they liked staying at home C．there was no modern transportation D．they were forbidden to go to other countries
A．The farther a man goes, the more treasures he gets B．The more a man sees, the more knowledge he gets C．Travelling is more interesting than reading D．The farther a man goes, the more books he reads
A．it is interesting B．it is cheaper than to go in any other way C．it can cross the wide oceans D．it takes less time