多囊肝（）。

A.肝脏有圆形孤立性薄壁无回声区，后方回声增强

B.肝脏布满大小不等的无回声区呈蜂窝状，囊与囊之间的肝实质回声增强

C.肝脏有圆形孤立性无回声区，壁厚呈双层结构，后方回声增强

D.肝脏满布大小不等的无回声区呈蜂窝状，囊壁不规则，囊肿与胆管相连

E.肝脏有不规则形囊性占位，壁较厚，内透声不好，可见较高回声的点状或斑片状回声

Besides being able to walk on for three days without drinking, camels can also live for a long time ______ small quantities of food. 

A．with

B．on

C．by

D．without