不需要做间隙保持器是下列哪种情况()
A．第一恒磨牙早失
B．恒前牙早失
C．乳尖牙早失
D．乳磨牙早失
E．乳牙接近脱落时拔除时
参考答案：E
—What do you think of Linda's latest CD?
—_____. I've listened to it many times. [ ]
A. Not at all
B. Of course
C. Oh, I enjoy it a lot
D. I really don't like it
支气管哮喘的临床特征
A．吸气性呼吸困难B．反复发作、阵发性、呼气性呼吸困难C．反复发作，吸气性呼吸困难D．夜间阵发性呼吸困难E．肺部有较多的哮鸣音伴肺底湿啰音
