I can't jump in the pool, the water is ___________ cold.[ ]

A. too

B. very

C. to be

D. that

患者，男，62岁，缺失，缺牙区牙槽嵴条件好，牙龈萎缩，近中舌侧倾斜，前牙区口底较深，基牙，行大支架连接的可摘局部义齿修复

向缺隙侧倾斜，用导线观测器观测，属第几型观测线()

A．一型观测线

B．三型观测线

C．五型观测线

D．二型观测线

E．四型观测线