I've _____ all the photos in the drawer, but I still can't find the one you need. [ ]

A. opened up

B. given away

C. handed out

D. looked through

根据摩擦物体的运动状态，摩擦可分为静摩擦和动摩擦两种，动摩擦的摩擦系数大于静摩擦系数。