鼻翼向外下与面颊部交界处的浅沟是（）
A.鼻背
B.鼻根
C.鼻梁
D.鼻唇沟
E.鼻底
参考答案：D
The children went home from the grammar school, their lessons __________ for the day.
A．finishing)
B．finished
C．had finished
D．were finished
心肌细胞的慢通道可被何种药物阻断
A．河豚毒
B．四乙基铵
C．Mg+
D．Ba2+
E．异搏定
