下列生命活动中，不需要ATP提供能量的是（　　）

    These are Cara and Ben. They are twins (双胞胎). They are twelve. This is their bedroom. It's a nice room. There are two beds in the room. The yellow bed is Cara's and that green one is Ben's. The twins have one desk and two chairs. The chairs look the same. Cara's sweater is on his bed. Ben's coat is on his chair. Their clock, books and pencil-boxes are on the desk. Their schoolbags are behind the chairs.

如图，△ABC中，CD⊥AB于点D，⊙D经过点B，与BC交于点E，与AB交与点F．已知tanA= $\frac{1}{2}$ ，cot∠ABC= $\frac{3}{4}$ ，AD=8．