胰岛β细胞分泌胰岛素属于
A．外分泌B．旁分泌C．内分泌D．自分泌E．动作电位刺激细胞分泌
参考答案：C
Tom often _____ TV on weekends. Today is Sunday. He _____ TV now.[ ]
A. watch, is watching
B. watches, is watching
C. watches, watching
D. watches, watches
文徵明小楷书法作品的风格特征是什么？
