Question

In autumn, leaves turn yellow and _________ the trees.

A．fall out

B．fall off

C．fall down

D．fall over

Answer 1

B

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。