— The students sitting at the back can't see the blackboard ______.

— Why not ______ them move a little forward? [ ]

A. clear enough, let

B. enough clear, letting

C. clearly enough, let

D. enough clearly, letting

患者女性，40岁，以自发性低血糖，血浆胰岛素水平升高，渐进性记忆力下降，精神恍惚等临床表现而入院，B超及CT检查示胰头部肿瘤，手术切除。

术后送检肿块直径1.5cm，包膜完整，切面灰红色，镜检如图，最可能的诊断为（）

A.慢性胰腺炎

B.胰腺囊肿

C.胰岛素瘤

D.胰腺腺癌

E.慢性胰岛炎