桥堵
参考答案：
进入井内的泥砂在一定条件下将井眼某一部位堵死。
秦统一六国中的决定性战役是 ；使秦朝走向灭亡的决定性战役是 。
— May you succeed in the coming entrance examination. —（）
A.I’m so happy!
B.No, I’m not good at studying.
C.Yes. May I succeed.
D.Thank you, the same to you.
