设函数f（x）=|2x+1|﹣|x﹣4|．
“我们亚洲，山是高昂的头…亚洲雄风震天吼”．相信你熟悉这首歌，那么你对亚洲了解多少呢？请读图，完成下列要求．
It takes us ________ hour to go there by ________ bus.
____ stories, Mike told me all about it.
