双胍类降糖药的作用机制不包括( )

A．促进组织对葡萄糖的摄取
B．减少肝细胞糖异生
C．刺激胰岛β细胞释放胰岛素
D．增加胰岛素与其受体结合

. If a teacher gives a student _______ hearty smile, the student will treat the teacher as _______ agony aunt.

A．The; the

B．不填; an

C．不填; the

D．a; an