《马可·波罗行记》中的“外国巨价异物及百物之输人此城者，世界市场诸城无能与比。”“此城”是指[ ]

A、长安   

B、洛阳   

C、东京   

D、大都

It is amazing that the little boy can swim ________the river ________100 meters in width.

A．across; measuring

B．over; measured

C．across; measured

D．through; measuring