当热能和机械能发生转变时，可获得最大可用功的过程是（）。A.准静态过程 B.平衡过程

A: What do you usually do after school , David ?
B: ____1_____ How about you , Jenny ?
A: I usually do my homework . ____2_____
B: What sport do you usually play ?
A: ____3____
B: I don’t like basketball . My favorite sport is tennis , and I often play tennis .
A: ____4_____
B: No , I can’t . ____5_____ He often plays volleyball with his friends      

I usually draw pictures . I like playing basketball . But my brother can . I can’t play basketball . Can you play volleyball ? But sometimes , I play sports with my brother .