成人单纯性牙周炎主要是
A．垂直型牙槽骨吸收 B．水平型牙槽骨吸收 C．混合型牙槽骨吸收 D．牙骨质增生 E．牙根吸收
参考答案：B
“Geili”, popular Chinese Internet buzzword, is now widely accepted by public as an adjective describing something that’s “cool”.
A．the , a
B．a , a
C．the , the
D．a , the
总括性学习又称下位学习。( )
