宣誓是公安民警对自己肩负神圣职责和光荣使命的庄严承诺和保证。( )
参考答案：对
---Have you heard of Liu Qian from Taiwan?
---Sure! His magic performance is ________ surprising for people _______ forget.
A. so; that B. such; that C. too; to
防止流砂现象的方法有（）。
A.土壁支撑
B.井点降水
C.打板桩
D.地下连续墙
