In our city, citizens have free _____ to the library, which makes it easy for them to read any book they like.

A．time

B．entrance

C．charge

D．access

李某某，女，38岁。患肢端动脉痉挛病年余。两手指尖最初发白，继而青紫，发紧，麻木，厥冷，抽搐，置冷水中则痛，右手指末梢破溃，中西药及针刺均未效。目视舌淡红，两侧有白腻苔，诊其脉均细弱。试分析其主证、病机，并拟出治法和方药。