世界园林有（）园林三大系统。
A.东方、西方和北方
B.东方、西亚和欧洲
C.东方、西亚和非洲
参考答案：B
患者，男，39岁，左上6因大面积银汞合金充填要求冠修复。查：左上6大面积银汞补，补物完好，不松动。X线牙片显示：左上6根管治疗良好。拟为该患者行左上6铸造全冠修复。
铸造全冠颈部肩台宽度通常为 （）
A.无肩台
B.0.5～0.8mm
C.0.8～1.5mm
D.1.5～2.0mm
E.25mm
The teacher and writer, as well as many guests ____ invited to the party held yesterday.[ ]
A. is
B. were
C. are
D. was
