1.die out : 1）Elephants would die out soon if men were allowed to shoot as many as they wish. Many old customs are dying out. 3）The fire died out in the end.

(灭绝，绝种）

(逐渐消失）

（熄灭）

It’s bad news that quite a few rare animals are__ each year. dying off B. dying out C. dying from D.dying away(风，声音等逐渐消失)