题目

 Not until all the fish died in the river ________ how serious the pollution was. A．did the villagers realize B．the villagers realized C．the villagers did realize D．didn't the villagers realize 答案：A北回归线自西向东穿过我国省区的简称是（ ）A．藏、云、桂、台B．云、桂、粤、台C．台、粤、桂、云D．闽、台、粤、云