—Have you ever seen Zhou Libo’s talk show?—Yes. It's very funny and it often makes people .
A:to laugh
B:laugh
C:laughing
图一、图二反映的共同主题是 ( )
如图,在线段AB上有两点C、D,AB=24 cm,AC=6 cm,点D是BC的中点,则线段AD=____ cm.