新生儿肺透明膜病是由于缺乏（）引起的，多见于（）。
参考答案：肺表面活性物质；早产儿
He asked me for this book many times. Please tell him he ______ get it tomorrow.
A．must
B．would
C．shall
D．should
骨膜下脓肿阶段是患者疼痛症状高峰期，其临床表现除外（）
A.剧烈持续的跳痛
B.触痛明显，Ⅲ度松动
C.相应面部的反应性水肿
D.根尖部牙龈红肿和扪痛
E.体温和白细胞计数正常
book many times. Please tell him he ______ get it tomorrow.