-What were you so ________？

-My son's not passing the college entrance examination ________ me most.[ ]

A．upset; upset about 

B．upset about; upset   

C．upset for; upset  

D．upset; upset

小肠是吸收的最主要部位，这主要与小肠的哪项特点有关

A．长度
B．肠壁厚
C．通透性高
D．面积大
E．消化酶多