内翻性 * * 状瘤来自()
A.鼻腔及鼻旁窦黏膜的上皮组织
B.鼻前庭皮肤
C.鼻中隔前部的皮肤
D.鼻咽部黏膜的上皮组织
E.以上部位均可
参考答案:A
To our great________, his parents were________at his mark.[ ]
A. surprises; surprised
B. surprises; surprising
C. surprise; surprised
D. surprise; surprising
试述我国历代农书提出的主要农业经营思想与生产知识。