In autumn leaves turn yellow and the trees.A. fall out B. fall off C. fall down D. fall

问题补充：

In autumn, leaves turn yellow and the trees.

A. fall out

B. fall off

C. fall down

D. fall over

答案：

A. fall out

(答案→)B. fall off

C. fall down

D. fall over

解析：考查短语辨析。fall out退出，fall off从什么掉下，fall down摔倒，fall over

急于做某事，句意：在秋天，树叶变黄从树上掉下来。故选B。