肠绒毛
参考答案：
小肠黏膜上皮和固有层结缔组织向肠腔伸出众多的指状突起称小肠绒毛。
— I rang the bell for a long time last night, but no one opened the door.
— Oh, the family __________ a party and they didn’t hear the bell.
A．had
B．were having
C．had had
D．have had
反映犯罪本质特征的是（）。
A、刑事违法性
B、刑罚惩罚性
C、社会危害性
D、违法性
