51．For what purpose is the text written? 　　　
(A)Offering students cheaper tickets．　　　
(B)Announcing the opening of a premiere. 　　　
(C)Telling the public of the cinema's address. 　　　
(D)Increasing the cinema's membership.

写作意图题。该文为一则广告，主要是吸引学生成为剑桥艺术电影院的会员，因此D项正确。