下列属于哺乳动物和人体“内环境”的是[ ]
A．肺泡腔内的气体
B．心室腔内的血浆
C．小肠腔内的消化液
D．膀胱腔内的尿液
答案：B
Little Ann likes wearing her mother's clothes, so she a woman. [ ]
A. looks at
B. looks for
C. looks like
D. looks after
乳磨牙根尖周病变瘘管最常出现的位置是
A．颊侧根尖区黏膜B．颊侧根分歧处黏膜C．舌侧根尖区D．舌侧牙颈部E．根侧黏膜
