王冰《黄帝内经素问注序》云：“篇目坠缺，指事不明者，量其意趣，加字以昭其义。”此种校勘法属（）
A.对校
B.本校
C.他校
D.理校
参考答案：D
Students _____ eat, drink or smoke in the computer room. [ ]
A. aren't allowed
B. aren't allowed to
C. didn't allowed to
大动脉的特点是（）
A.内膜厚且光滑
B.外膜厚
C.中膜富含弹力纤维
D.中膜平滑肌发达
E.中膜致密结缔组织发达
