Mary felt sad over the loss of photos she had shot in Australia, _____ that was a memory she especially

treasured. [ ]

A. as

B. which

C. when

D. where

对于瘙痒症以下叙述不恰当的为（）

A.某些物理、化学刺激及药物也可引起该病的发生

B.病因繁多，常与某些系统性疾病有关

C.临床上仅有瘙痒症状而无原发性皮肤损害的皮肤病

D.临床上很少见到继发皮损

E.积极寻找原发病因并进行相应的治疗，是预防该病的关键