单项选择题
The modern people like travelling now because（）
A．it can bring us more knowledge B．it can make us rich C．they have too much money D．it is a good idea
单项选择题 We say Columbus made the world larger, that is to say （）
单项选择题 The people in ancient times couldn't travel too far away places because （）
单项选择题 The reason why people like to fly today is that（）
