8世纪前半叶，世界上领域最大的帝国是（）
A.阿拉伯帝国
B.波斯帝国
C.唐帝国
D.拜占庭帝国
参考答案：A
______ I went to London, I was strongly impressed with the beautiful buildings.
A．The first time
B．For the first time
C．It was the first time
D．By the first time
动机在需要的基础上产生。
