胎儿期曾使左右心房相通的孔是（）。
A.第一房间孔
B.第二房间孔
C.房室孔
D.卵圆孔
参考答案：A, B, D
加强编制管理的正规化建设，要求今后凡是公安执法岗位的人员，必须由公安专项编制来解决．( )
What did he do with his old car
A．He maintained the old car.
B．He planned to replace the old car.
C．He discarded the old car.
D．He had his old car fixed.
