声音的传播需要________, 声音可以在________中传播,还可以在________、________中传播,但不能在真空中传播。
介质;气体(空气);固体;液体
— Is Mr. Smith in his office now?
— No, he _____ there. I _____ him in the library a minute ago. [ ]
A. may be, saw
B. can't be, see
C. mustn't be, see
D. can't be, saw
“启我爱医术,复爱世间人,愿绝名利心,尽力为病人,无分爱与憎,不问富与贫,凡诸疾病者,一视如同仁”,出自的著作是()
A.《本草纲目》
B.《省心录·论医》
C.《迈蒙尼提斯祷文》
D.《外科正宗》
E.《备急千金要方》