Migrations take place on land，in water, or in the air． Some anim

Migrations take place on land，in water, or in the air． Some animals migrate only short （）．Other migrations cover thousands of miles or kilometers．

A、

periods

B、

spans

C、

distances

D、

lengths

【正确答案】：C
【题目解析】：

由下句可知，前面说的也是空间上的距离。“短距离”用“short distances”表示，故选C。句意：有些动物只能迁徙很短的距离。