典型脊髓灰质炎发热呈（）
A.稽留热
B.弛张热
C.间歇热
D.双峰热
E.波浪热
参考答案：D
Our English teacher is very nice. We _____ friends since three years ago. [ ]
A.were
B. became
C. have been
D. have made
上颌垫附双曲舌簧矫治前牙反，舌簧加力时间间隔是（）
A.每天加力
B.2～3天
C.每周
D.两周
E.每月
垫附双曲舌簧矫治前牙反