A switch from first in first out (FIFO) to last in first out (LIFO) :（）

A. results in a more meaningful inventory valuation during periods of rising prices.  

B. will result in higher taxes and smaller cash flows.  

C. results in a lower current ratio during periods of rising prices.

患牙左上6于外院复合树脂充填后，很快出现不敢咬物，冷热刺激痛，去除刺激后疼痛可缓解。其可能原因为（）

A.充填物悬突

B.去龋未尽

C.咬合高点

D.复合树脂对牙髓组织的化学刺激作用

E.未行酸蚀