嵌体洞缘斜面预备的目的是（）。
A.预防釉质折断
B.减少边缘微漏
C.操作方便
D.增加边缘封闭
E.有利于修复体固位
参考答案：A, B, D
补全对话。
Mike: Hi, Tony, let's 1_____ baseball.
Tony: 2_____ sounds good, Mike. That 3______ fun.
Mike: Do you 4_____ a baseball or a baseball 5_____?
Tony: Oh, no. I don't have a baseball and I don't have a baseball bat.
Mike: 6_____ your sister, Gina have a ball or a bat?
Tony: Yes, 7_____ does. Hi, 8_____! Where 9_____ your baseball and bat?
Gina: They're under the bed.
Tony: OK! 10_____ play.
男性，20岁，患过敏性哮喘急性发作前来就诊。体检见患者严重呼吸困难伴轻度发绀，两肺满布哮鸣音，心率110次／分，下列治疗不作为首选的是（）
A.脱（减）敏治疗
B.应用激素
C.应用β2受体激动剂
D.补液
E.吸氧
