肾盂肾炎最常见的感染途径是（）
A.血行感染
B.淋巴道感染
C.直接感染
D.上行感染
E.下行感染
参考答案：D
股前外侧皮瓣的临床应用有（）
A.修复皮肤缺损
B.修复肌腱缺损
C.修复神经缺损
D.修复血管缺损
E.修复硬脑膜与颅骨缺损
Unlike watching TV, reading is a highly active process________it requires attention as well as memory
and imagination. [ ]
A. until
B. but
C. unless
D. for
