视神经穿过巩膜处形成筛板区，包括()
A．神经节细胞层
B．神经纤维层
C．筛板前层
D．筛板
E．筛板后区
参考答案：B, C, D, E
---What happened to the house ?
---It _____burnt to the ground.
A is said to having been B. is supposed to have been
C is reported to have been D. is believed to have
当事人要求在合同成立前签订确认书的，合同自（）时成立。
A.签订确认书
B.达成一致协议
C.签字
D.盖章
