单项选择题
As the student kept saying "no" ,the American mod.（）
A．became disappointed B．got angry C．lost interest D．could not continue the conversation because he did not know what else he could 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 （）
单项选择题 The modern people like travelling now because（）
