Pandas became _____(稀有) and there are now only about 1,000 in the world.

问题描述:

Pandas became _____(稀有) and there are now only about 1,000 in the world.
说明原因吧

rare
adj.稀有的;半熟的;稀薄的
adv.非常;极其
vi.用后腿站起;渴望直接填啊?是的